Where is it? Maybe someone in the group would take a look at it for you. Do you have sellers, name, address, phone #, where he bought it to verify that purchase by him? Have you talked to this person on the phone and got a "feel" for him/her? Will he ship with half payment and a "hold" check cashable for the other half on your acceptance.
Overall though, audio people tend to be a very honest lot, your concern is justified, but a couple of precautions as above and what others are going to suggest and you will do fine.
Overall though, audio people tend to be a very honest lot, your concern is justified, but a couple of precautions as above and what others are going to suggest and you will do fine.