It is probobly simular to the same as you are required to surrender a car if you fall behind on the payments. So yes they would have to leave untill acompanied by a police officer. so they go out the gate call the cops and come right back. Does this accomplish anything but waste the cops time? YOU still do not keep the car!
---My guess is most will just take the car, cause if you call the cops on them the cop will be there for them to take the car. Either way you do not keep the car.

