yes, some thing sounds 'scammy' to me too...just not sure how...
could it be that you are not allowed to change it - only the name on it can change it....so you would have to give him the document...
does he still have any documentation at all?
i too would not have refunded... if i did he would not have got the price he paid....cheek sod...the end of the road is hardly enough tomake that kind of decision...
could he have done anything to the car? was it out of your sight?...like extract and exchange parts?
that would have been risky of course, the risk that you would not take it back...but still...