The one thing I can think of came from another eBay seller who sold expensive items and what she said she was going to start doing after a buyer tried to scam her.
Video non-stop the item; the item with any serial number being placed in the package/box; the box being sealed; the shipping label showing yours and the buyer's name and address; the tracking number and finally the package being handed to the shipping carrier. It is important that the video be non-stop because if an issue arises the buyer can claim that during the video was stopped the item could have been removed from the package and a different item substituted.
If the item is small enough you can take it to the post office or carrier's place of business with you and follow all the steps above. If the item is too big/bulky to carry to the post office then perhaps you can arrange for carrier pick up and follow the steps above and video the package being handed to the carrier.
And as justsharingourtreasures said, request signature confirmation!!!!!!!!!!
This is a lot of work but just in case the buyer claims the box/package was empty or they received an entirely different item than what was shipped you will have proof and it won't be another case of he said/she said.
For future reference another alternative is to let a reputable third party company sell expensive items and pay a commission to them once they sell the item .
