"Whoever takes (any letter, postal card, or package) out of (any post office or any authorized depository for mail matter, or from any letter or mail carrier, or which has been in any post office or authorized depository, or in the custody of any letter or mail carrier, before it has been delivered to the person to whom it was directed, with design to obstruct the correspondence, or to pry into the business or secrets of another), or opens, secretes, embezzles, or destroys the same, shall be fined under this title or imprisoned not more than five years, or both."
句尾“opens, secretes, embezzles, or destroys”只是alternative的行为动词对应句首的“take”。就是所你可以用这任何其中一个动词replace句头的“take“来完成句子。 （1）内指的是物件（2）指的是in post office/before it has been delivered 。
如果你有其他的解读也不妨发表一下。
