(a) Cases referred for institution of legal proceedings. No action will be taken on any petition after the case has been referred to the Department of Justice for institution of legal proceedings. The petition will be forwarded to the Department of Justice.

(b) Conveyance awarded for official use. No petition for remission of forfeiture of a seized conveyance which has been forfeited and retained for official use will be considered unless it is filed before final disposition of the property is made. This does not affect petitions for restoration of proceeds of sale filed pursuant to the provisions of section 613 of the Tariff Act of 1930, as amended (19 U.S.C. 1613).