In the future, make sure your application includes make & model of vehicle, and license #...But that is the future...
I assume that you also do not have any current address for this person...
Several ways to find the new address..
1. run a new credit check after 2-4 months to see if a new address shows up.
2. Hire a skip tracer to find him..costs might be under $100 if you are lucky...
Once you have the new address...do some early evening scouting to see if there is lights on at the new rental, and if so...scout out the parking lot for their vehicle...
Even with all that...me thinks is still might be wasted efforts and expenses...
At least you have a judgement, that could ber up if and when this person wants to purhase a new auto/home etc and the lender will not due to the judgment that you have...and if you are lucky, the loser will have to clear the judgement in order to purchase...
Good luck...sometimes it takes a long wait...to get satisfaction.
--70.109.xx.xx