The CBP Deputy Commissioner's has advised:
"The 9/11 Act amended the SAFE Port Act by establishing that if an interim final rule [on container security] was not issued by the Secretary of DHS by April 1, 2008, all containers in transit to the U.S. would be required to be secured with a bolt seal by October 15, 2008.DHS does not anticipate that an interim final rule will be issued by the April deadline. Therefore, effective 10/15/08, all containers will be required to be secured with the standard bolt seal."
(According to the Implementing Recommendations of 9/11 Act of 2007 (9/11 Act), the containers would be required to meet the requirements of the International Organization for Standardization Publicly Available Specification (ISO PAS) 17712 standard for sealing containers.)