those wheels might not be your best bet...do searches every couple days for stuff sold online...I am sure he won't change the tires to sell the wheels.
Sadly it's likely he will get the car back but everything will be gone...if they are nice they will leave his passport and what not in the car...some times that happens....had a friend get his car gutted and they left his wallet..empty of cash of course and a few other personal things in the car.....they only wanted the parts.
best of luck...I will keep my ear to the ground and eyes open...I work in S.F. and that is place numero uno for this stuff to show up.