I sold almost 100 FPGAs using escrow to more than a dozen people on here.
The worst problem I ever encountered was someone who took a day or 2 to acknowledge receipt of their shipment. I think if you ship a package with signature required and showing the correct weight you can simply include in the terms that an 'empty box' claim has to be supported by video and you will be fine.
Ok, I'm realizing that escrow is highly preferred around here, so I'm updating the terms to say that John K escrow is acceptable. I assume he takes a cut; that would be paid by the buyer - eg. if he takes a 5% cut, a 120btc bid would end up paying 126btc (120 to me, 6 to John K).
If anyone has a link to his terms, please share!