[Happy2BMe]

Anybody seen Hans Blitz in the last couple of days?

[R. Scott]

The cited article and other news reports do not say when the material “disappeared”. It could have been removed prior to the continuation of the war. The site was known to store the explosives, and should have been secured as soon as possible and an inventory taken. I vaguely remember news reports from the time of the initial combat that the area was secured and inspected – and nothing was found but empty and blown up bunkers.

From Fox News:

Iraqi officials sent a letter to the IAEA on Oct. 10 to inform the agency that tons of HMX and RDX explosives were missing from the Al Qaqaa military installation south of Baghdad. Officials believe the material was looted following the fall of Saddam Hussein’s government in April 2003.
...
ElBaradei told the United Nations in February 2003 that Iraq had declared that "HMX previously under IAEA seal had been transferred for use in the production of industrial explosives, primarily to cement plants as a booster for explosives used in quarrying."

So far I can find nothing to indicate that 380 tons of high explosives were simply left in the open to be used by the Iraqi insurgents.