Each telephone utility shall have an office in one of the counties of this State in which its property or some part thereof is located and shall keep in such office all such books, accounts, papers, and records as shall reasonably be required by the Office of Regulatory Staff to be kept within the State. No books, accounts, papers, or records required by the Office of Regulatory Staff to be kept within the State shall be removed at any time from the State except upon such conditions as may be prescribed by the Office of Regulatory Staff.