On which day will PO boxes be closed and mail returned to sender for lack of payment?

PO boxes will be closed and mail returned to sender for lack of payment on the 11th day. This policy is implemented to ensure that customers maintain their payment obligations to retain access to their PO boxes. After the payment due date passes, the post office provides a grace period for customers to settle their account. However, if the payment is not made by the 11th day following the due date, the box is locked, and any mail that accumulates is returned to the sender. Understanding this timeline is crucial for managing PO box services effectively, ensuring that customers do not miss out on important correspondence.