I had something similar happen. The day Fedup was supposed to deliver a bike from California, I checked the tracking status and it showed it was already delivered! I walked all around the house, checked with my neighbors... no bike.

I then went back to the Fedup website and was able to find the address it was delivered to, then did a Google search on that address. It was delivered to the Bikeology LBS just a few miles from the seller's house.

Tear off those old tags!