Is there a drop box for license plates

Yes

Yes. If your address is different. I would walk in and get the receipt. You can also mail them. Send by mail to: New Jersey Motor Vehicle Commission P.O. Box 129 Trenton, New Jersey 08666-0129 Note: You must include a self-addressed, stamped envelope in order to receive a receipt once you surrender your plates by mail. You will need to save this receipt. It will serve as proof that the plates were surrendered in the event that charges are wrongfully acquired on them.