The P.O. Box system is still unreliable. It doesn't find the right location and address of the owner. It's always been used as a business address hence the said online goods gets to the office first before you personally. It only takes the Postal Service, DHL, UPS, FedEx, or any other shipping/freight/delivery services to have a continuous input of mail on a certain P.O. box to make them remember where to deliver it and on-time.

"Everything in this book may be wrong." Illusions: The Adventures of The Reluctant Messiah by Richard Bach