Confirm who is named importer before you believe the portal. It matches on entry numbers, and it only knows entries FedEx made on its own bond. A tracking number from an entry filed under any other importer comes back empty. That reads like a refusal. It is not one. You say FedEx was importer of record. Pull the 7501 on a few parcels and check the box anyway. Then you know which of your numbers the portal can ever answer.
