Dude comes over my house after reading a craigslist ad for a mesa cab. Says he is in a rush, so he cant bring his head or anything to try it. He shows up and I have my amp and guitar plugged into it and my guitar ready. I play it a little and he puts his ears to the speakers and listens. Decides he wants it after a few minutes of talking. Lowers me on the price i posted by 40 bucks, which I didnt want, but whatever. I help him load it in his truck because he is older. He proceeds to leave. Today, about 5 days later, he calls me and says the one speaker is bad and I will be buying a new speaker, or refunding him the money. "Correct me if im wrong, but you put your ear to each speaker before you bought it." He claims it wasn't sufficient volume to tell it was blown. A couple swear words on his end after I say he is being a pain in the Arse. Anyways, i sad I would call later, as Im at work. I want to tell him to shove it when I call later. He had every opportunity to try it out longer, plus he did listen to the speakers himself and agreed to buy it. How do I know he didnt blow the speaker himself? What would you guys do?