I'm going through PMDT (Package Mis-Delivery Trauma).
I've been following a FedEx shipment that's supposedly been on the truck for delivery today. (Their estimated delivery date had actually been yesterday.) So finally their site said it had been delivered to my front door, no signature required, two hours ago. Nope. Not so. I've been here and I knew no FedEx truck had come to the house. I looked all around, went down to the road and checked the mailbox just in case, then drove around to the house with the same address on another road where we frequently get each other's stuff. Nothing. Came back and tried FedEx's "chat", disputing their delivery notice, whereupon "chat" informs me that this package was to be handed off to the USPS and they're the ones delivering. So I try USPS tracking, and they have no info "yet" on this tracking number.
I think the technical term for this is: dead in the water.