If a ballot is returned in person by the elector or the elector's agent or designee to a place of deposit other than the election administrator's office, the election officials on location shall:
(1) keep a log of the names of all electors for whom the officials receive ballots;
(2) deposit the unopened signature envelope in the sealed ballot transport box provided for that purpose; and
(3) securely retain all voted ballots until they are transported to the election administrator's office. The transport boxes must then be opened and the ballots handled in the same manner provided for ballots returned under 13-19-309.