Basically a lot of global logistics runs on trust.
If a driver is delivering a pallet to the FooCorp warehouse, he doesn't get given a copy of the FooCorp org chart, or get an example signature to compare against the signature they're given, or get given a map or a secret password or anything like that.
He just pulls up to the building that says FooCorp on it, says "got a delivery for FooCorp", they let him in and he accepts any name and signature from whoever is near the door.
Obviously. But if there is 400 grand on the line, you'd think someone would actually check(when the claim is made). The receiver would say "you have a signature from person X. Person X doesn't actually work here". Fedex then says "ok, prove it" - and then the receiver does, in whatever way is legally acceptable.
Edit: in fact, let me add a bit more - if the shipment was delivered to the right address just signed by someone who didn't actually work there then sure, I think FedEx would be in the clear. But they delivered the parcel to the wrong place - the fact that it was signed for by someone is almost irrelevant, it's the same as having no signature at all.
As far as FedEx is concerned, though? They were not contracted to get any specific name or signature. They were contracted to deliver to a certain address. The GPS says the driver went to the right address, to within the accuracy of a GPS trace. The driver got a name and signature at that time. The driver marked the delivery as successful in their computer.
Maybe they call up the driver and say "Did you deliver to the wrong address?" and the driver says "I don't think so, but I make a lot of deliveries so I can't say for sure."
Sure, in reality the pallet was dropped off in the parking lot across the road from Ship Fusion, instead of at Ship Fusion. But FedEx's records say everything is in order.
To be clear I'm not saying this is good, I'm just saying it's normal.
[1] I'm not sure how they check the number, because they accept the ID number of anyone in the family and even the full time cleaner of the building. They type it and the app takes a second to show a green check. I guess it's a fuzzy list to prevent obvious scams.
I think what happened here is that the FedEx driver was in such a hurry to drop off that he saw a bunch of people apparently outside Shipfusion, stopped and said 'Hey, delivery for you', rather than going and finding the proper entrance to the loading dock. And to be fair, that's the corner with the company logo on it - looking at Google Streetview I can't see a logo at the back of the building where the loading dock is!
And to be even more fair to the driver, they are often given utterly unrealistic amounts of time to drive to the next drop, or to complete the drop. They can only complete their rounds by cutting corners.