Another one, maybe the biggest known one, is when the US sent 12 bn to 14 bn in the form of 100 bills (yup, in bills) using a military plane to Iraq and these bills mostly all mysteriously vanished.
12 to 14... billions.
At least 1.4 bn was found to have been stolen and stored in a bunker in... Lebanon (I don't remember if it was just located or seized). Overall an estimated 9 bn are unaccounted for I think.
(trying to insert the wikipedia and NY Times link to the story/stories but I get a "we have trouble processing your request, sorry" from HN)
There were wire transfer to the tune of billions too. But the 100 bills shrink-wrapped and flew in a military plane: you cannot make that up.
Shady stuff if any...
EDIT: like Iran-Contra, I'm pretty sure in the future movies are going to be made about these $100 bills.