The agent shall maintain the originals of all documents at his principal office. All documents originating at other domestic ports and at foreign ports shall be transmitted as currently as possible to the principal office of the agent. The agent shall in all cases perform his audit and review functions promptly and shall be in a position to supply complete documentation for a current audit by representatives of the owner. The agent shall maintain to the maximum extent possible a complete and orderly file of all authorizations for facilities, services and supplies, and complete tariffs and port schedules covering charges at domestic and foreign ports incident to the operation of the vessels assigned under the agency agreement.