Whoever, being a Postal Service officer or employee, embezzles any letter, postal card, package, bag, or mail, or any article or thing contained therein entrusted to him or which comes into his possession intended to be conveyed by mail, or carried or delivered by any carrier, messenger, agent, or other person employed in any department of the Postal Service, or forwarded through or delivered from any post office or station thereof established by authority of the Postmaster General or of the Postal Service; or steals, abstracts, or removes from any such letter, package, bag, or mail, any article or thing contained therein, shall be fined under this title or imprisoned not more than five years, or both.