What action does the Post Office take if a PO Box is not paid by the 10th day after the due date?

The Post Office takes the action of closing the PO Box and returning all mail to the sender if the payment is not made by the 10th day after the due date. This policy is in place to ensure that customers fulfill their financial responsibilities regarding their PO Box rental. If the fee is not received within the specified time frame, it becomes necessary for the Post Office to close the box to prevent continued occupancy without payment. Returning the mail to sender is also a measure to ensure that mail is not left unattended in a box that is no longer active, which can lead to potential security and organization issues. This strict adherence to the fee schedule helps maintain the operation and efficiency of postal services.