Identification of map. The Official Zoning Map shall be identified by the signature of the Mayor, together with the date of the map, and shall bear the Town Seal under the following words: "This is to certify that this is the Official Zoning Map referred to in the Zoning Ordinance of the Town of Hillsville, Virginia." The Official Zoning Map shall be located in the office of the Zoning Administrator and shall not be removed from that office except for official purposes authorized by the Zoning Administrator.