New Jersey Statutes Title 19. Elections 19 § 63-24

The county board of elections shall keep, for two years, all of the requests and applications for mail-in ballots, all voted mail-in ballots, and all of the certificates that have been detached or separated by them from the inner envelopes. All inner envelopes together with their certificates, and the contents of those envelopes not opened by order of the county board or Superior Court, shall also be retained for the same period by the board. The superintendent of elections in counties having a superintendent of elections and the prosecutor in all other counties shall have the authority to impound all mail-in ballots whenever the superintendent or prosecutor, as may be appropriate, shall deem such action to be necessary.