Look it over and if it looks ok and the paperwork is good, make a cheeky offer way below its real value.
most people will by nature run a mile if it can't be flown or even run.If it has been on the market for a while the seller may be very "motivated".I got a very nice 4-1200 for less than 2/3 it's real value.the seller was also very happy someone finally made a no b,s offer. Win win.