Did the American military ever see the boxes of explosives?
If you can prove that, then the statement that "they had been removed before we even got there" is false.
This article by Barton Gellman, dated April 5, 2003 (Thanks Josh Marshall) shows just that.
http://www.washingtonpost.com/ac2/wp-dyn?pagename=article&contentId=A31589-2003Apr4¬Found=true
Excerpt (italics mine):
"In the first of yesterday's discoveries, the 3rd Infantry Division entered the vast Qa Qaa chemical and explosives production plant and came across
thousands of vials of white powder, packed three to a box. The engineers also found stocks of atropine and pralidoxime, also known as 2-PAM chloride, which can be used to treat exposure to nerve agents but is also used to treat poisoning by organic phosphorus pesticides. Alongside those materials were documents written in Arabic that, as interpreted at the scene, appeared to include discussions of chemical warfare. "