N.J. Stat. Ann. § 19:53B-10

19. After voting the emergency ballot and before leaving the polling booth or the designated voting area, as the case may be, the voter shall place the voted emergency ballot in the pre-punched single-hole plain white envelope. The voter shall seal the envelope and shall retain custody of the envelope until the member of the board having charge of the voting machine at that time is ready to accept the envelope.