In short....

NOTICE OF REMOVAL

"This shipment contained item(s) that were determined to be an illegal importation. U.S. Customs and Border Protection has the responsibility to intercept and seize illegal items when they are attempted to be brought into the U.S. by any means."

The letter then goes on to list Schedule 1 Controlled Substances...
marijuana, hash, LSD, smack, coke, etc.

"These items are considered contraband and are immediately forfeited to the United States."