You have been involved in a minor traffic collision with a parked vehicle and you can't find the owner. You must:

If you collide with a parked car or other property, leave a note with your name, phone number, and address securely attached to what you hit. You must report the collision to the local city police or, if the collision was in an unincorporated area, to the California Highway Patrol (CHP).
DMV Writen Test