Let me point out straight away that this is purely hypothetical curiosity. I have no connection to any stolen books (AFAIK).
The stolen book threads on here have me curious though. Let's say I read a thread, and realize some pricey book I purchased was in fact stolen. Perhaps I bought it at a con and have no idea who the dealer was. Perhaps I bought it from an LCS. Say I paid ten grand for the book (I know that's an odd purchase to make at a con without having some seller ID info, again this is hypothetical). Good person that I am, I contact Robbed Collector and tell him I have his NM 98 PGX 11.0 Very Mint comic. I assume as stolen property I am obligated to surrender the book to its owner, which I would of course do. Am I then out $10K? Seems like all that does is transfer someone else's misfortune onto me. If it came from an LCS, I assume I'd have the law on my side to recoup my purchase money, and it would then be on them to track down their source of the book and try and recoup their own purchase price. I assume this all falls under receiving stolen goods or something like that, and whoever comes forward with the stolen book kind of has the hot potato and eats the cost unless they can track down whoever sold it to them. How does this really work? I bet someone here has some unfortunate experience they might be willing to share.