Except in the case of articles described in § 45.31(a)(3) , every package of tobacco products, and cigarette papers and tubes removed under this part shall have the words "Tax-Exempt. For Use of U.S. Not To Be Sold." adequately imprinted on the package or on a label securely affixed thereto.
27 C.F.R. §45.46
72 Stat. 1422; 26 U.S.C. 5723