Information, books, and records made available to, and reports filed with, the Secretary under subsection (a)(6) shall be kept confidential by all officers and employees of the Department, except that such information, books, records, and reports as the Secretary deems relevant may be disclosed by such officers and employees in any suit or administrative proceeding that is brought at the request of the Secretary or to which the Secretary or any officer of the United States is a party, and that involves the order issued under
section 4533(b) of this title.