New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 10A-13

Any notice required to be given by this act shall be in writing and sent by certified or registered mail, return receipt requested, to the last known address of the person to whom the notice is to be given. In the event that the notice is unclaimed by the addressee, or if the address of the person to whom the notice is to be given is unknown to the person giving the notice and cannot be ascertained from the records on file with the Division of Motor Vehicles, the notice shall be given by publishing it twice in at least one newspaper published in this State and circulating in the municipality in which the motor vehicle is left.