When I had my SP10 sent to me it was held up at shipping. They wanted me to send them an FCC paper stating what the device was and something along with homeland security. Held up my delivery and extra day.
One form was called - department of homeland security. IMPORTER ID INPUT RECORD

and the other form was STATEMENT REGARDING THE IMPORTATION OF RADIO FREQUENCY DEVICES CAPABLE OF CAUSING HARMFUL INTERFERENCE.

Both these forms were sent to me by the shipping company via email. Had to fill them out and then email them back.