In the 1st place: If I got something wrong, I would first ask myself whether it was due to poor spec or if it is my own fault. In case the later, I wouldn't dare to ask to take something back. In case of the poor spec, I can still imagine it would be easier to write something off or sell to/swap with another person, instead of sending something back. Not in all cases. Depends. What I mean to say is that 'wrong' doesn't automatically mean refund in the 1st place.
A destroyed item rules out a refund. Kindest you could do is going the route of refunding the residue value to the seller. In this case next to nothing. I would still find that generous.
A destroyed item rules out a refund. Kindest you could do is going the route of refunding the residue value to the seller. In this case next to nothing. I would still find that generous.