If you have the agreement and the VIN number you can still put a Mechanics lien on it. For future reference you do not have to have the title in the buyers name to plate it. Remember when you buy a car on time from any type of finance company they hold the title. Also never give out your VIN when selling a car if someone wants it over the phone to run a "Check" or "carfax" they can use the VIN to put mechanics lien on the car you are selling, and make life difficult for you...
Shouldn't you be writing SHTF stories?!?!?!