My second to last order, the 7 cds, was shipped by DHL, not FEDEX FICP. That order was made 2 months previous to my last order. DHL still retained the shipping details in its database (I can access this information by using the tracking number on DHL's website). That shipping information indicates that the US customs clearing process can, and in that case did, start in Japan when DHL received (or even before its receipt of) the shipping information from CD Japan:
"Customs clearance status updated. Note - The Customs clearance process may start while the shipment is in transit to the destination. - CINCINNATI HUB - Ohio - USA".