27 C.F.R. § 19.497
Obliteration of marks
Except as otherwise provided in § 19.487(b), the marks required to be placed on any container or case under this part must not be destroyed or altered before the container or case is emptied.
Except as otherwise provided in § 19.487(b), the marks required to be placed on any container or case under this part must not be destroyed or altered before the container or case is emptied.