So I'm trying to buy an acoustic guitar locally from OfferUp. The guy replied quickly and asked if I could meet him today. I emailed I could do so at 2pm after pinning down his approximate neighborhood. He emailed to say ok to that meeting time, but provided no address. I emailed back to say that I'd meet him in the parking lot of a Burger King in that neighborhood at the appointed time. Then he goes totally silent, this is about 2 hours before the time to meet. I email back that I need a confirmation about the meeting point and time at least an hour ahead of the time, since I was driving some distance. Still nothing. He went silent when I suggested a public meeting spot. That smells like trouble to me, from a personal security perspective. I assume I need to let it die, but the guitar is still listed. He only wants $20 for it, so perhaps he's not sufficiently motivated. He has some other positive reviews on OfferUp, but that is no guarantee of anything. The seller could see my pic in my profile and would know I'm no spring chicken! What would you do?