(d)
Retention of records
Each record required to be maintained under this section shall be kept by the person required to make it at the place designated by him pursuant to subsection (a)(4)(C) of this section for a period of at least five years from the last day of the calendar month of the year with respect to which such record is required to be maintained.
(f)
Authority of Federal Bureau of Investigation
Agents of the Federal Bureau of Investigation shall, at any place designated pursuant to subsection (a)(4)(C) of this section by any person required to register by subsection (a) of this section, at all reasonable times, have access to and the right to copy any of the records required to be kept by this section, and, in case of refusal by any person registered under such subsection (a) to allow inspection and copying of such records, the United States district court for the district in which such place is located shall have jurisdiction to issue an order compelling production of such records for inspection or copying.