Right now, if someone opens a SNAD because something doesn't fit and because we know ebay will side with the buyer, we refund the item and eat the shipping etc. we still get the defect. That's BS.
I also don't see how it is a seller defect if the USPS loses a package. It isn't the buyers fault, so they should have recourse, but provided the item was shipped in the stated time frame, and with appropriate tracking, the seller has done all he can do.