I have visited multiple sections of the Slovenian borders, which I will describe below.

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Hungary-Slovenia
I only pictured one marker of this border, the very last one before the tripoint. It has "M" on one side, "RS" on the other side and "a" on the side facing the tripoint.
A map on an information sign shows that this marker will be "A1" and the next ones A2, A3 and so on.
Once this was the border of the EU, a sign still reminds us of this time. The tripoint is a nice monument. From here one can follow the border between Austria and Hungary or continue along the Slovenian-Austrian border as I will describe below.

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Austria-Slovenia
From the tripoint onwards the markers start with section I, pole 1-01 presumably, but the first one I can find is 1-02. The next markers are on both sides of the path. They are marked with Oe for the Austrian side and RS for the Slovenian side. I only followed a short section, till stones I/2. Not too far away was an interesting information sign about how the border changed here in the last years.

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Another section I followed is in Bad Radkersburg, starting with marker IV/31. These markers are on both sides of the river, pointing towards the border point in the middle of the river. I must have missed IV/33 somehow. Maybe it is not there anymore. IV/35 has been fallen down and is now hiding near a bench. Around the bridge that connect Radkersburg and Radgona the markers are partially harder to find and partially nicely embeded in the renoated bridge. I don't know where 38 is, but 39 is almost under the bridge.
On the other side of the bridge however there is no sign of a marker 39, but 38 is very visible. The stones IV/40 are the only ones I can find on both sides of the river. The last stone I can find along the river is IV/42 on the Austrian side of the river.

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You rejoin me at the Taubenkogel, near the tripoint with Italy. We have reached section 27 (XXVII) and the first stone I can find here has number 270. Markers 271 and 272 are nearby, as are some warning signs about the state border. I didn't see marker 273 and marker 274 took me a bit as well. This is not a stone, but a marker in the ground. We are on top of the Taubenkogel here. There is a lift going to this point as well. The tripoint gets quite some attention here, at the Austrian side of the border. Markers 275 and 276 are similar signs as 274. I can't find 277, probably a similar sign as well.
278 is more of the same, now in front of a typical mountain restaurant. Next up is 279, but I can't find 280. Should be somewhere around the gate. Marker 281 and 282 look like they have been renewed. Marker 283 is a good old fashioned stone again. Marker 284 is a stone as well, but it is a new one. Not only cows can walk freely here, but horses as well. The next four markers are bottom plates again. Next up is stone 290 and bottom marker 291 Border stone 292 is almost laying down. Stone 293 is located next to the tripoint monument, that is not on the tripoint, but completely in Slovenia.
But stone 294 is not far away. This is the real tripoint, Slovenia meets Austria and Italy here, and with this also three different language groups and cultures meet each other here

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Austria - Italy
From the tripoint I follow a short section of the Austrian-Italian border as well. The stones are small, this feels like a gloomy border. No reason to celebrate the border, just demarcate it with the cheapest stones one can find.
Thd first markers after the tripoint (p-519) are p-518 and p-517a. I am not following this border further for now.

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Slovenia - Italy
From the tripoint I continue following the border between Italy and Slovenia. The tripoint is marker 1. Next up is marker 1/1, next to the tripoint monument, followed by some markers not too far away. After marker 1/4 the border (path) starts to descend seriously.
I am not following the border now, that would be way too steep. The path follows the border on the Slovenian side. I miss a lot of markers here, but that's not a surprise. 1/10 is close to the path. 1/13 and 1/14 are close to the path as well. 1/16 too, although it is hard to read the number. The next markers 17, 18 and 19 are easy to find. At marker 1/20 I start following a small path next to the main path. It continues for quite a long time and is not being used as a path anymore. After marker 1/34 the path gets really overgrown and it gets harder to follow it. After marker 1/41 the border starts making a strange corner. Around marker 1/44 a lot of forest works are going on. I can't find marker 1/45. After marker 1/46 I leave the border and continue to my apartment in Rateče

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In the late afternoon I make another walk from my apartment in Rateče to the Italian border. Marker 2/11 is a large one and is placed at the first big road crossing. The toll station is manned and cars are being checked randomly. There is also a monument near the border. On the other side of the road should be marker 2/12, but I can't find this one. I can find marker 2/13, not far away. Here the border crosses the cycle path and the next few markers should be inside an area that's way too overgrown for me right now. The next markers I can find are 2/18 and 2/19. They are really large for both sides of a cycle path, but this has been a railway in the past, so that will probably explain why they are here. Marker 2/20 was hard to find and is broken. I couldn't find 2/21 I was able to find 2/22, but missed 2/23. We are in a bushy patch of land between an Italian path and the Slovenian cyclepath (former railway) here.
The markers 2/24 till 2/27 are in this patch as well. This is the last marker I explored around Rateče.

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On August 30th, 2025 I arrive in Nova Gorica. Another interesting section around the Italian-Slovenian border. Here the border was drawn right through the old city of Gorica after World War II. The most northern marker I can find here is 55/23. 55/24 might have disappeared. At marker 55/25 the border can be freely crossed now, a few years ago this was still a fence of someone's house. I walk to the river from here, but can't follow the river bed to the border because of foliage and a high water level. Marker 55/26 has the letter R, which has to do something with the fact that the border is the wall of the house here. I am not able to find marker 55/27, it should be somewhere on this corner. We continue at marker 56, where a road crosses the border. On the other side of the street is marker 56/1. I do not visit marker 56/2 (not on a path) but I do find 56/3 and 56/4. That was not an easy one, hidden between some foliage. 56/7 was hidden as well, behind a fence that still forms the border here for quite a while. I miss more markers here, but I do find 56/9 and 56/12. The next border crossing for vehicles is at marker 56/15, with the large marker 57 on the other side of the road. Now a long series of small markers follows. The border is still quite inaccesible here, mainly because the border is equal to the backside of people's properties here. At the first bit I am not finding all the markers because of the foliage, but I do find 57/6 and from 57/8 I can find all of them in this section. Marker 57/15 is an interesting one. It is located in front of the train station and exists more ore less double these days. The original marker is in the southern side of the square, and there is one monument-like plate in the middle of the square, directly in front of the main entrance of the train station. Very noticable around the train station is the old border wall that is still existent here. The fence is gone and in some places the wall as well, but for the largest part it is still there. The border markers are placed within this wall, as can be seen here from marker 57/16 towards 57/21. These were actually the first markers I pictured after arriving in Nova Gorica. The next morning, August 31st, 2025, I start with marker 57/22. This is placed at another border crossing for vehicles. There is not so much activity going on here. You can follow the railroad here and cyclists and pedestrians can actually go through the unused second railway tunnel. Therefore I visited the markers on top of the hill later in the morning. I found the markers 57/26 till 57/29 on this higher bit. When passing through the unused railway tunnel one will rejoin the border at marker 57/30, that I couldn't find. Marker 57/31 was an easy find though.
The border does interesting things around here, it now goes around two houses that belong to Slovenia. There are four markers here, of which I can spot 57/32, 33 and 35. The border continues following the railroad, with a backyard fence continuing all the way. Between markers 57/40 and 41 the border can be crossed again by pedestrians and cyclists. There is an artwork here as well. The markers 57/42 and 43 are closeby and close to each others as well. 57/45 is another marker that I can find, but after this I keep following the railroad, but can't find any more markers, untill I am too high up and not able to go down over there. I follow the railroad back, cross it and via the Slovenian side reach the markers 57/51 (with an "R" again) and marker 57/52 very close to it. On the other side of the road is marker 58, the last one I can find here around Gorizia.

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At the train station of Nova Gorica was an interesting open air museum about the borders though, containing some posters. Between them was this picture of border marker 81. On street view the original location is still very recognizable these days. Not much has changed, apart from the soldiers who are not stationed there anymore.