For items requiring an export license, Postal Service personnel at Post Office facilities must verify that the customs declaration is complete (see 123), including a license number in block 17 and an ITN or AES Downtime Citation (see 520) in block 11 on the May 2009 and January 2009 editions of PS Form 2976-A, or block 16 and an ITN or AES Downtime Citation (see 520) in block 10 on the September 2012 edition of PS Form 2976-A.