Good luck with your collection, though I hope that somehow those records can be reunited with their rightful owner.
Maybe someone wrote something on a sleeve or left some price stickers on some of them, etc. that can be used to identify it from all the other potential claimants that just want to get the music from you for free.
Re: returning to the rightful owner — I certainly plan to look through them, but so far I'm thinking that most of them came from a record shop (many have little generic price stickers still on them), of which there are dozens in LA. Additionally, since they're vintage they've probably changed hands many times, and it's also unclear how long ago they were stolen.
All that said, if by happenstance I do get an opportunity to return them to their rightful owner, I'd be happy to.
Those crates really tie the room together :)