§ 263.2 Policy.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
It is the policy of the U.S. Postal Service to establish and maintain schedules specifying the retention periods required for all official and duplicate record copies. Furthermore, it is the policy that all duplicate record copies and non-record material will be disposed of as soon as they have served their purpose.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.