A principal of a private investigative agency shall notify the director of the addresses of all branch offices under the same name as the main office as a part of the agency application. The director shall issue a duplicate license for each of the branch offices showing the location of the main office and the particular branch. Each duplicate license shall be prominently displayed in the office for which it is issued. The principal shall notify the director by mail, within thirty days, of any changes to branch office addresses to include additions or deletions of branches.