27 CFR 19.12: Furnishing facilities and assistance.

The proprietor is required to provide TTB officers with the necessary facilities and assistance in order to gauge spirits in any container, or to examine any apparatus, equipment, containers, or materials, at the distilled spirits plant. Also, when requested by a TTB officer, the proprietor must:

(a) Open any doors and open for examination any containers on the plant premises; and

(b) Provide the exact locations (including the number of containers at each location) of all packages and similar portable approved containers within a given lot and the locations (that is, buildings, rooms, or areas) where spirits in cases are stored.