any of the classes hereinbelow indicated shall be punished by a fine of not more than three hundred pesos o r by imprisonment for not more than six months, or both: TaDSHC SECTION  2691 . Unlawful Importation of Merchandise . — Any person who shall fraudulently or knowingly import or bring into the Philippine Islands, or assist in so doing, any merchandise, contrary to law, or shall receive, conceal, buy, sell, or in any manner  facilitate the transportation, concealment, or sale of such merchandise after importation, knowing the same to have been imported contrary to law, shall be punished by a fine of not more than two thousand pesos or by imprisonment for not more than two yea rs, or both. ADHcTE When, upon trial for a violation of this section, the defendant is shown to Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 861 ARTICLE  IX Offenses Connected with Administration of Bureau of Customs ( e ) Any person who shall commit any act prohibited by the Postal Law or who shall omit any act enjoined thereby, for which act or omission no specific penalty is provided by law. ( d ) Any person who shall obstruct or retard the passage of any mail matter, or who shall obstruct any person or conveyance carrying mail matter, or shall arrest or detain upon any process, except for crime, any person engaged in the transportation of mail m atter while in the discharge of his duties. ( c ) Any person who, without proper authority, shall paint, print, or in any manner place upon or attach to any building, vessel, or any vehicle not actually used in carrying the mail the words "Philippine Islands Mail", "United States Mail", or any words, letters, or characters of like import, or who shall give notice in any manner that any vessel or vehicle is used in carrying the mail when the same is not actually so used. ( b ) Any person who, without authority from the Director of Posts, shall set up or profess to keep any office or place of business bearing the sign, name, or title of "Post Office", or shall establish an unauthorized post office anywhere within the Philippi ne Islands. ( a ) Any person who shall unlawfully make use of any official envelope, label, frank, or indorsement authorized by law or regulation to avoid the payment of postage or registry fee on any mail matter.