39 C.F.R. § 946.3
Claims submitted with respect to property subject to this part, possession of which is unlawful, must be denied, in writing, by certified mail and the person submitting the claim must be accorded 45 days from the postmarked date to institute judicial proceedings to challenge the denial. If judicial proceedings are not instituted within 45 days, or any extension of time for good cause shown, the contraband property must be destroyed unless the Chief Postal Inspector or delegate determines that it should be placed in official use by the Postal Inspection Service. Property subject to this part, the disposition of which is involved in litigation or is subject to an order of court, must be disposed of as determined by the court.
39 C.F.R. § 946.3