Earlier quoted context omitted.
I tend to agree with the first half... Maybe I'm a bit tin-foil, but I feel like if intelligence was involved they'd just intercept it en route, and wouldn't bother sending it all the way back to the US, especially in a trackable way for that matter...
The second half was more of a joke. I agree with you, they would probably hide it, unless FedEx was dumb enough to mess up and show it when they shouldn't.
The truth is probably that FedEx is just terrible at their job and goofed it.