Unfortunately, the return policy means NOTHING. People can return even if you say NO RETURNS and they do.
I have 3 day to let me know on most items and am pretty liberal with that. But people will return much later without letting me know and get refunded.
Buyer will say missized when measurements are in listing and item is not mis-sized. they will make up anything.
Ebay system is very one sided to say the least.