Unless he got it for a few bucks, shouldn't matter. If the seller insured it he can file a claim and get the cash including shipping amount back. Usually as long as you submit good pics showing said damage on the claim online, itll get granted without USPS needing the item turned in. Otherwise, if you paid any kind of decent amount, and seller didn't insure and wont refund outright, I'd open a ebay dispute. Don't do a paypal one. If you do it through ebay instead of paypal, they will refund you if he doesn't have the funds in his account. They will probably want you to send it back to him though. If so, just do it via first class if the weight will allow. Slap it in the same shity mailer and send it back with del confirm only and submit the tracking info on the dispute.