Wow, very sorry to hear that. You put together a very impressive collection there. I hope it all works out for you.
As Bruce mentioned, the only way to identify them would really be with high quality pictures. If you put them online somewhere, then people could cross reference the list when something comes up for sale. Outside of that, I don't think there is much anyone here can do with just a list.
Also, correct me if I'm wrong, but since the insurance company already paid you for your loss, assuming you found one online for sale and was able to get the seller to hand it over to you or the police, wouldn't the poster then get returned to the insurance company since they are technically the owners of the poster now? I've never dealt with filing a stolen property insurance claim, but that was my understanding of how it works. But I also think that it would be very difficult to go after a seller. You might get lucky and find it being sold on eBay or CL by a local guy, where you could get the police involved. But unless it's local, or you get lucky and someone sends it to a guy like Bruce who is honest, I think most sellers wouldn't cooperate unless they were forced to - and how likely are the non-local-to-you police to get involved?