((a)) ** Marking requirements of the customs laws** Articles entered under shall not be subject to any marking requirements of the customs laws, except that when any such article is entered for consumption under it shall not be released from customs custody until the marking requirements of the customs laws have been complied with.section 1752 of this titlesection 1753 of this title
((b)) ** Packaging, marking, or labeling requirements of the internal-revenue laws or the Federal Alcohol Administration Act** Articles entered under shall not be subject to the packaging, marking, or labeling requirements of the internal-revenue laws or of the Federal Alcohol Administration Act [ et seq.], except that any such article failing to comply with such requirements—
((1)) shall be conspicuously marked prior to exhibition “Not labeled or packaged as required by law—not for sale”, and
((2)) when entered for consumption under , shall not be released from customs custody until such packaging, marking, and labeling requirements have been complied with.