Your money at work

Guards at a bank in Baghdad made off with $282 million in US dollars.
There were questions about why the bank had so much money on hand and how the thieves made it through the various checkpoints. more
Although this is not as bad as the $4 billion Bremer mislaid in Iraq, William suggested that some of the "stolen" money may have been "mislaid" and then added in to the amount stolen to account for it. Why didn't Bremer think of that? He could have just said the $4 billion was stolen by some guards.