Edit: also always ship USPS that way the buyer has committed mail fraud and if you really get pissed you can file a complaint with the postal inspector , just file using the buyer and EBay. That is what needs to happen to put a stop to this!
I did that same as you but eBay will actually send you to collections very quickly if they can't collect from your credit card. I filed a complaint with CA State AG and hired a lawyer to sue them for dereliction of duty. I ended up getting the collection removed and it cost me about 80 hours of time, but I probably cost eBay/Paypal well over $30K in legal fees.
I haven't sold anything on eBay in ages. If I ever come to the point where I think I want to sell somethingon eBay I just donate it to a charity