I have not heard of nor am I aware of the US Customs nor USDA treating incoming shipments from overseas; it is not in their charter which is to inspect incoming goods, verify documentation, and collect duties. Properly treating a shipment and providing the appropriate documentation is the responsibility of the shipper/buyer. If products arrive and are discovered not be as described and/or improperly documented they are confiscated and destroyed and an advisory letter / postcard warning is is mailed to the individual that was to receive the shipment; one GSAS member received a visit from the USDA.
75 Gallon, 2X55W AH Supply CF 8800K, 1XMarineland Doublebright, 2X Marineland 350 Magnum; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0 36"/46W; 20 Gallon, 1X26W AH Supply LED kit; all with Press. CO2; (Calcined) Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)