There was a case on the Peoples Court where a husband was trying to get his ex-wife to pick-up the satellite dish she won in the divorce. He called her 3 times to no avail. He put it outside by the railroad tracks and it disappeared. She sued him for the cost of the dish but the judge said, too bad. You should have picked it up when you won your judgement. Your lucky he doesn't charge you storage fees.

Check with your local court. Around here, they have one day a week for free legal advise. Seems that notifying the guy via phone would suffice, but keep the phone bill to show you called him. Then push the car onto the street. If it's towed, called him and tell him where he can claim his car.