I had a similar issue happen last week. Sold a fluttering dmd. Stated it all in auction and the buy it now was $35 so price reflected. I plugged it into a machine the night before I shipped to make sure all okay other than flutter. Shipped off and get an ebay message from buyer saying I sold him garbage. He included a pic that made it look like he pried it apart. Ignored what it looked like he did and offered full refund. Guy never responded and just negs. 100% perfect feedback for years gone. He then has the audacity to ask for a refund a day later post negative. Lol. I see he filed a complaint with ebay saying he never got it but eBay acknowledged he did because I bought the shipping through ebay. Idiot.

It's basically censorship. Ebay has given all power to the buyer, don't you dare challenge them or else you get a scarlet letter. Reminds me of a lot of others things in life.