Management Instruction FM-640-2023-1 - Postal Bulletin 22652 - Contents Publications Publication 431 Revision: Changes to Post Office Box Service and Caller Service Fee Groups Effective June 13, 2024, Publi..." /> Management Instruction FM-640-2023-1 - Postal Bulletin 22652 - Contents Publications Publication 431 Revision: Changes to Post Office Box Service and Caller Service Fee Groups Effective June 13, 2024, Publi..." />