I remember from a while back after the Ukrainians initially got the HIMARs one of the operators in a video mentioned that they were hiding in old Soviet built hardened bunkers, and shortly thereafter there was article detailing this. Anyway, in the article, from what I remember from reading it, when the Soviet Union collapsed, a lot of the record keeping was done in each administrative district, and as a result a lot stuff never wound up going back to Russia. The Ukrainians, either with great foresight or just as a matter of policy, kept all this well organized, whereas the Russia's either didn't wind up with much in the way of records from the breakaway republics, or never really bothered with keeping them centrally in the first place (another possibility is that they have the records, it's just never been dealt with).
This could explain why the Ukrainians know where all these bunkers are in Ukraine (and perhaps Kursk, given the proximity) and why the Russians don't. If you recall, when the Russians first invaded, many of the troops were found with road maps that dated back to the 60s, which doesn't exactly bode well for a lot of things, but record keeping of any type stands out. At any rate, this may well be a large part of their secret sauce when it comes to logistics.
As I mentioned earlier, the Soviets were clearly very concerned with end world stuff and from what I understand, every town pretty much has these sort of hardened underground bunkers, many of the villages with more than one. The assumption that the Russians would know where all these sort of facilities are in Kursk may well be backwards.
If that is in fact the case, it would potentially give the Ukrainians the ability to stage their logistics in forward areas easier than we are thinking.