The seller did not accept PP (which I did not notice until I won the auction), so I paid directly with my AMEX. And yes, I spoke to three different reps at AMEX, and they each said I was out of luck. They only provided assistance for transactions up to 90 days old. By the time I called, the transaction was @ 135 days old. They did not care about the reason, even though it was proven a counterfeit.
I asked AMEX and EBay to each come up with suggestions on different ways to tackle this- item not as described, report an issue with a seller, policy violation, etc. etc. None of those were fruitful to circumvent their respective 90/30 day policies.