Today I Learned: If you take your FedEx door tags into a FedEx Office center and ask where your packages are, they simply can’t tell you. “Door tag number <> tracking number!”
PRO TIP: You can look up the tracking numbers on the spot using your phone by typing in the door tag numbers, then you can tell them to FedEx, and then they can help you. FedEx can’t manage this trick internally.
Good luck.