He could have brought it to a "chop shop" in Philly. I'm sure there are a number of them.
eg: Chop shops are illegal garages that buy stolen cars, disassemble them, and sell their individual parts for profit. To avoid being caught, criminals disassemble a car within hours of stealing it. That way, the owner and the police will never be able to find it.
He would have to have connections. A guy looking like him doesn't walk around Philly asking about chop shops. At least not for long. If anything he left it in a specific part of town with the keys in it. Or he sold/traded it to a dealer whom would gladly use it for awhile and dump it.