Quoted from phil-lee:

This is it in a nutshell. I listed an antique boat windshield with new white rubber moulding. Someone contacted me and asked to purchase just the moulding, I told him it all stayed together. The same person won the auction, I shipped, and he immediately asked for a return, that my listing was inaccurate. Bay wanted me to pay for return shipping. When I got it back, the rubber moulding was missing. The Buyer admitted in writing he just wanted the moulding and had no intention of paying for it.
So I opened a Case, Ebay/Paypal sided with the Buyer, I lost the Moulding, Return shipping fees.
An Internet search reveals thousands of cases like this.