Sorry your wheels were stolen and good luck getting this resolved.
Here's my opinion:
It would be MORE fair if you posted about them right after they were stolen. Or perhaps reported it to the police right after they were stolen. Someone may have seen your posts and NOT purchased the wheels. It's months later now.
I'm not sure what I'd do in your situation, but I don't think someone who unknowingly purchased stolen property (according to you) is just going to hand over a set of wheels because you say they used to be yours. If I was on the other side of things, I'd definitely want the police involved.