This has happened with last 2 or 3 with my FT packages. Tracking will show as "delivered" but it's not to your address. Then a few days later, it will suddenly appear in your mailbox.

I spoke to USPS on the phone and in person, they suspect that the drop shipping service on the US side is being shady and printing out the same mailing label, with same tracking number, but different address several times - over and over. In other words, they're paying for postage once, and reusing that same label, but with different addresses. This is an issue that FT needs to speak to their US drop shipper about - or find a new drop shipper.