Unfortunately, FedEx does not allow for shipment to PO Boxes. If you receive an order to a PO Box, and you ship with FedEx, these orders will unfortunately need to be cancelled. You can notify buyers about this policy by including a note (e.g., "Cannot ship to PO Boxes" in your listing details, Closet About Me page), or after order, by sending them a message via our post-order chat function.
Should you choose to "save" the sale after a buyer purchases an item, you can reach out to the buyer and ask if they might be able to receive the item if shipped to a different address. Otherwise, you will need to cancel the sale.