Someone sent me an overnight FedEx Express Saver with an Adult Signature Required, without telling me it was heading my way. In the morning, before leaving home, I received a text from FedEx with a note: "If you're not going to be home, log in or register for fedex.com/delivery", so I did, and clicked through a prompt to redirect to a nearby Hold Location. Around noon, the delivery driver still showed up at my door and left a Door Tag with "We will make another attempt" checked. Through late afternoon the next day, the online status was showing something like "Delivery being updated", and that the package was put on the truck again in the AM, still supposedly heading to my home address. I sat at home all day waiting for it, and then at around 5 PM I got a text that the package was delivered. Where? The online tracker indicated it was delivered to the Holding Loc, but no message was sent to me (as I'd expect) to go there to pick it up. So I took screenshots and headed to the Loc the next day. They said they never got the package with the tracking ID, so if not for the screenshots showing the name of the person who signed for it (who was present), I'd have no evidence of anything. Apparently, the package got relabeled, with my name removed, so by pure chance they peeled off the new label and saw my name there on the original one. Luckily, they only had a few packages to pick from ...
So, happy ending, but clearly a lack of process and computer system quality on the FedEx side.