Dead letter treatment of first class mail

§ 4108. Dead letter treatment of first class mail (a) The Postmaster General shall send first class mail which cannot be delivered either to the addressee or sender to a dead letter office. He shall cause enclosures of value, other than correspondence, to be recorded. When the sender or addressee cannot be identified, he shall bold the letters or parcels for reclamation for a period of one year after which they shall be disposed of as he directs. Letters and parcels without valuable enclosures may be disposed of by him without record and not held for reclamation. (b) The Postmaster General shall return to the senders by registered mail ordinary dead letters containing $10 or more m cash, and parcels of the first class which apparently contain matter valued at $10 or more. The minimum registry fee, in addition to such other fees as the Postmaster General may prescribe, shall be collected at the time of delivery.