If they were already gone, why did the AP report on 4/05/03 that we found them?

According to an AP report, U.S. solders visited the Al Qaqaa in April 2003 and "found thousands of five-centimetre by 12-centimetre boxes, each containing three vials of white powder."[2] Officials who tested the powder said it was "believed to be explosives."[3] Yesterday, "an official who monitors developments in Iraq" confirmed that "US-led coalition troops had searched Al Qaqaa in the immediate aftermath of the March 2003 invasion and confirmed that the explosives, which had been under IAEA seal since 1991, were intact."[4] Thereafter, according to the official, "the site was not secured by U.S. forces."[5]