What you described is not unusual and it's also one of the most difficult ebay situations for a buyer to deal with.
This is a problem that I encounter with TRSs as often as I do with sellers whose FB is anything but stellar.
Return shipping with tracking will cost more than $10 and probably closer to $16.
Chances are very high that a seller who will sell you junk, will also claim the item didn't arrive unless you ship with tracking...........
So you're stuck between a rock and a hard place.
A lot of $$$$$ is spent shipping garbage back and forth between buyers and sellers.
For a buyer, it's a no win situation and just part of the cost of buying on ebay.