The important thing is that whatever the return policy is - whether it's "return it any time" or "no returns whatsoever" - it should be disclosed on the listing so that there is absolutely no ambiguity about what the buyer is getting into.
If return policy is not disclosed, all bets are off.
There was a guy once who bought an AT from me, and months later it started not keeping time well. He said that I was responsible for maintenance(!) and won a credit card chargeback, so he kept both watch and money - basically theft. That's even with a well described watch and very clear return policy. I have the debt collectors after him now.
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