I knew I overlooked something. Dang, I forgot about that honesty thing.
It's entirely possible that the place was looted after we secured the area and before we conquered Baghdad. It's also possible that it was looted by the Republican Guard and fedayeen before the U.S. even reached Al Qaqaa. It would surprise me if Saddam's men planned a guerrilla war and DIDN'T steal these explosives before the Americans reached them.