27 CFR 22.26: Detention of containers.

(a) Summary detention. An appropriate TTB officer may detain any container containing, or supposed to contain, alcohol when the appropriate TTB officer believes the alcohol was withdrawn, sold, transported, or used in violation of law of this part. The appropriate TTB officer shall hold the container at a safe place until it is determined if the detained property is liable by law to forfeiture.

(b) Limitations. Summary detention may not exceed 72 hours without process of law or intervention of the appropriate TTB officer. The person possessing the container immediately before its detention may prepare a waiver of the 72 hours limitation to have the container kept on its premises during detention.