On February 6, US Customs published an updated version of its Bonded Warehouse Manual for Customs and Border Patrol Officers and Bonded Warehouse Proprietors.
The document, last updated in 1990, provides guidance to all interested parties with a stake in bonded warehouses. Unfortunately, Customs has not yet provided guidance on which provisions have changed in the manual, which is nearly 200 pages long.
The complete manual is available here.