The only thing I can say is what was the value of the shipment? Anything above $800 will require duties to be paid. Since you have tracking info, have you submitted a where is my mail claim? If it is waiting for duties, customs clearance, you should have received a notification in the mail, yes, I know, you get a letter from the post office with their "efficient" service.
This place is huge, as I've toured myself numerous times. I work for an international courier company located near the airport and I'm very familiar with this. I'm an actual customs broker.
