N.J. Stat. Ann. § 51:6A-2

A buyer of precious metals as provided for in this act shall, before buying, attempting to buy or offering to buy any precious metals, register with the police of the municipality in which he intends to conduct his business and give his name and address. A transient buyer of precious metals shall, in addition to the information required of a buyer of precious metals, provide the address at which he intends to do business in the municipality and shall reregister if he changes his location of doing business in the municipality or if he discontinues doing business for more than 20 days in the municipality and subsequently wants to resume doing business therein. Any person who violates any provision of this section is a disorderly person.