So, if you were a banker down in the Texas borderlands, and a guy kept coming to you with deposits of huge sums of dirty, crumbling paper currency, and his stories about where it came from kept changing ("It was an inheritance." "We found it in an old rotted tree." "The wife won a couple of bingo games." "There was a Mexican leprechaun at the end of the rainbow.") would you be a little suspicious?
Yeah, well, so's the .gov.