N.J. Stat. § 19:31-10
The original and duplicate registration forms when filled out shall be filed alphabetically by districts at the office of the commissioner in separate sets of locked binders, one for the permanent office record and the other for use in the polling places on election days. Each set of the locked binders of original and duplicate registration forms shall consist of two volumes for each election district to be known as volume I and volume II. Volume I shall contain an index alphabetically arranged beginning with the letter "A" and ending with the letter "K", and volume II shall contain a similar index beginning with the letter "L" and ending with the letter "Z". In filing the forms there shall be inserted after the original and duplicate registration forms of each registrant a record of voting form with the corresponding serial number and the name and address of the registrant thereon. The binders containing the duplicate registration forms and the corresponding record of voting forms shall constitute and be known as the signature copy registers.
The original registration forms shall not be open to public inspection except during such period as the duplicate registration forms are in process of delivery to or from the district boards or in the possession of such district boards. The original registration forms shall not be removed from the office of the commissioner except upon the order of a court of competent jurisdiction. The signature copy registers shall at all times, except during the time as above provided and subject to reasonable rules and regulations be open to public inspection.
N.J.S. § 19:31-10