[rootusrootus]

If you'd have played dirty and initiated a refund, then sent a box of nothing back, you'd have won in the end. All eBay cares about is delivery receipts. Not saying you should actually do that, but OTOH an experienced eBay seller knows how it will play out so if they could be convinced you were about to do it (without, you know, giving them evidence to send to eBay), it might light a fire under them to contact USPS and trace the delivery.