What to do when the preamp you were ripped off on shows up online ?

Hi folks ,I bought a McIntosh C-2200 with factory box & remote ,I paid using PayPal instant payment but seller refuses to ship & refuses to refund the $3,500 I paid him ,I hesitate to say what site the stolen preamp is listed at but I've notified Agon staff of the eBay auction # as well as PayPal dispute case number ,I hate to see another audiophile get beaten out of $3,250 ,any suggestions on what to do next ? The C-2200 preamp was going to be my eldest sons Christmas present as he has coveted & drooled over the C-2200 in my all McIntosh 5 channel system ,any help would be great .