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

If this isn't your schmuck, eBay has a pretty good looking one with a BIN
https://www.ebay.com/itm/382649555772

The two ads referenced in this thread are both dealers with perfect feedback as far back as 2000 and 2001 with hundred of transactions between them so I hope it is not one of them.  If not contact one of them or Audio Classics.  

Elrod , Bingo ! But I'm not naming anybody ,I'm currently bidding on another one on eBay ,thanks for the links guys ,as for " the rest of the story " I'm not naming specific names because #1 I know Agon hates eBay drama being drug into the Agon forums , and #2 it now appears as if eBay had a hand in starting this mess ,I bid on about $30k worth of gear in 2 hours and made an offer of $15,000 to the seller selling the XRT-30s ,Mc-1201s and C-2200 ,my huge expenditure triggered a red flag on eBays computer and locked everything up ,at that moment the 4,000 plus feedback seller absolutely panicked ,sent messages calling me a scammer ,then messaged me that eBay instructed him to keep the preamp and keep my money ,we all know that's a crock of sh!t ,I sent the seller my phone number and litteraly BEGGED him to call me and he refused ,when he refused to speak with me on the phone even before I sent PayPal I shoulda known he was squirelly ,but I had just read a disclaimer by the mega honest PorscheCab where he was apologizing for not giving his phone # to buyers anymore due to eBay rules and went ahead & sent payment ,I even gave him an extra $100 just because it's Christmas & I couldn't get him to call me ,follow the BINGO and I need not say any names but if you buy don't expect any phone interaction 

I can't imagine going thru a UPS claim for smashed gear with a seller who can't be bothered to call a buyer spending $3,500 when the bulk of his sales are tube amp parts ,after hearing eBays side of the story I don't believe he's dishonest but he sure as hell isn't no Audio Salon , hi John : - )

What the heck does audiogon have to do with your ebay problems? Am I missing something?

I had the same question.