I would have given half back, but he did say, “no returns,” so... legally, he’s not entitled to it.
Of course, I wouldn’t have been a doof and sold it unopened.
I know a guy in town here who bought house that use to be owned by a banker from the 1880’s. That house has a built-in vault with combination known. We keep telling him to get it opened, but he just shrugs and says he hasn’t gotten around to it yet.
Do you actually believe he hasn’t opened it?