If we are talking about a $6 item fees are not really much of an issue.
You said this happened 8 times before....what did you do then?
Simple answer, tell the buyer they can return the item for a refund (less shipping of course). Let the buyer decide what they want to do (probably nothing) and move along.
If they buyer sent back the item in the original envelope from Hong Kong marked "return to sender" would it come back to me?
Not a good plan.....

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.