I had a security tag on it and PP did NOT CARE.
Did you mention and/or picture the security tag, in your listing?
Also, how quickly after the auction ended did the buyer escalate to a claim?
In other words, did they leave it sufficiently long that the listing was no longer viewable, do you think?
So sorry this is happening to you, BTW. Hopefully, something can still be done.
If it makes you feel any better, at all(?), you haven't really lost $20,000.
Depending on how you look at it, you've either lost a bag worth $9,000 + your time + expenses, or $11,000; not both.
Basically, the buyer stole the bag + your time taken to list it + any non-refundable fees. They didn't, also, steal the money; it's just as though they never paid you it.
After all, you would never have been in a position where you had the bag and the money, would you? So, in terms of loss, it's also either one or the other.
Still a hell of a lot to lose, though, I know.
