I'm am a retired Postal worker,The way to get any member attention is to report it to Ebay, But what truly works is you report its to the POSTAL INSPECTORS give name Of person his Ebay ID an address if you can get it. Along with proof of purchase an any message's you may have gotten from the seller,An also the 1's you sent to him as well.
The Postal Inspectors don't play around when it comes to Mail fraud an wire transfer as well as Fake Autographs being sold on EBAY.
They would gladly investigate it.

Hope this helps
IZZY