A couple of months ago I sent a package via FedEx to a colleague a few states away. There were two items inside, both relatively large (on the order of 64 cubic inches each), packed nice and snug with packing material and sealed up well, with a value set at $10k, overnight delivery.
Two days later (day after delivery) the recipient calls me up, and asks where the second item is.
Me: What?
Him: There is only one device in the box, and the packing material seems loose.
Me: Is the box damaged? Holes in the side? Ripped off tape?
Him: No, the box looks like it's sealed up well and everything seems normal, but the packaging is loose inside and only one of the two items is here.
I call up FedEx and explain the situation. They seem puzzled, but they open an investigation. At this point I've written the second item off and have started figuring out how to replace it (it was a one-off device). Several hours later FedEx calls back, apparently they "found" a mysterious device in their LA warehouse (the recipient lives in LA) and would like me to confirm a number that's printed on it. I verify the number, and they send it along to the recipient later that day, undamaged.
Either I have inadvertently developed a mechanism that causes electronic devices to spontaneously transport themselves outside of their box, or somebody at FedEx saw the declared value and decided to open up the box and pocket the most "interesting" looking piece inside, seal the box back up, and then send it along to the destination without a word. Later on they inspected what they pocketed, realized that they had NO idea what it was or what it could possibly be used for, and returned it to the warehouse. I thank them for returning it, but at the same time...WTF?