I would send the man back an email copying the ad and tell him that he had a chance to look through the stuff before he purchased it. You identified what he was getting and the fact that he took time to go through it he wouldn't have a leg to stand on in a court room. Sounds like one of those people that are not happy unless they are complaining or trying to take things from honest people. I wouldn't allow him to come back to the house, if he does tell him you will call the police.