To Rick's point, I think the first place to go is right here. This board is the central repository of information regarding questionable cars, this silver rs is no exception. I don't think anyone here is going to wave a flag from the rooftop (well, maybe CSharin

), but if the question is posed, an honest answer will be given - perhaps in public, perhaps privately.
Obviously, you can't tear a car apart right before it goes across the block, but there is enough time to find this board and ask. Some people don't ask for various reasons, and only come here afterwards - sort of like this buyer. If he had the expertise to find this site afterwards, why not ask about the car b4 he bought it?
Very few cars with a shady past are complete secrets from the sYc membership.