EBay retailer Bought and again wants his money back and threatens with ad?

I have the following problem and although I have a PlayStation Vr glasses yesterday so sold on 01.02.219 and now the buyer wants to have his money back.

He was with me and looked at them and also asked me if that would be good, of course it was. Have even a proof video of my buddy like him last weekend

played. After that we made it out and I stored it properly.

He then sent me the picture

well after the purchase he wrote me after 4 hours and said that would be broken everywhere cable breaks etc… He also fiddled with it himself with glue. But I know that is the cure and it was my question what can he do now? Am I a countermeasure?

If the drannrum fumbled, I would certainly not take back.

As long as she was really whole, he can't do anything to you, apparently you have a witness who can confirm that.

Should he show you, it will certainly be funny.
Private sale bought as seen.
No warranty, no warranty no money back. If you have not deceived him badly (which he would have to prove and what will become impossible if he fiddled with it himself) then he can do absolutely nothing.

Yes, but totally stupid… No, I honestly did not need it… I even brought it home to me because yes, I had nothing to hide. But yes, thank you.

He saw it, he bought it like that, he messed it up, it's a private sale with no returns and no guarantee, he has to prove that it was broken on sale, so he will not get away with it and probably will not show you either because he knows.

I've just listed it for the sake of completeness.