N.J. Stat. § 19:18-3
The clerk of the municipality shall attend at his office on election day, or appoint one of the clerks in his office to act for him, and keep his office open from the time the polls shall be closed until all the ballot boxes used at the various polls in the municipality at such election shall have been delivered at his office.
The clerk of the municipality or his subordinate whom he may have appointed to act in his stead shall enter in a book to be kept for that purpose the exact time when each ballot box may be delivered at such office, the district whence it was brought, names of the members of the district board delivering it, and the name of the police officer or other witness who may accompany them, and any other particulars he may deem important; such book shall be filed in the office of the municipal clerk and be preserved by him for two years.
N.J.S. § 19:18-3