(a) When required by the appropriate TTB officer, the proprietor must provide a secure cabinet equipped for locking for use by TTB.

(b) If one or more TTB officers are assigned to a distilled spirits plant to supervise operations on a continuing basis, the proprietor must provide a suitable office at the plant for the exclusive use of the TTB officers in performing their duties. The appropriate TTB officer will determine if the office facilities are suitable.

(26 U.S.C. 5178)