does that really matter? the car is just there as he couldnt get back - whether he takes it or someone else does then its no concern to me.
. . . only in that you might well think that the £16k is yours because its cash, but if it laundered money etc it can be retrieved from your account.
You'll have heard of cases where someone has bought a car privately only to find it was a stolen car. The insurance co / police retrieve the car to its original owner and the 'buyer' is left out of pocket.
Like I said, its not about being negative, its about you doing what you can to stay in control - good luck and hopefully this is it and alls well that ends well - enjoy your new car