It's really difficult to tell sometimes what damage there was to the car in a collision unless you were the one who arranged the repairs. I wouldn't trust the salespeople to give you a full account of it either, since their job is to sell the car. Is there a mechanic or someone you could take it to have it inspected? In Denver there used to be a place called AutoMD's that specialized in inspecting used cars (that's where I had my Si inspected before I bought it), there might be something like that around you. I would also try to leverage a lower price...it definitely is not worth the full KBB value.