So last night I met a guy at a club my band was playing at later in the night. He bought a '04 Gibson guitar from me that came with the unfilled warranty card. He gave me a certified bank check, we shook hands and he took the guitar and went home. He calls me today and says he doesn't like the neck on it. I'm nice and say if he drives to my home I'll take it back. He lives about 70mins away. When I open the case the warranty card is not in there. I told him I won't take it back without the card. He says he does not have and doesn't remember taking it. I know for a fact I saw him walk out with it in his hand as I walked him to his car so he wasn't walking down the road alone with the guitar. The guy claims I'm ripping him off over a useless piece of paper. I say that if I buy a guitar from Gtr Center and try to take it back a few days later without the paperwork they would not take it. Am I right? I told him if he finds it to come back. Not sure he will want to after some of the things he said to me. Any thoughts???