From the truth of fiction link you provided - "The news report went on to say that the yellowcake "had been stored in aging drums and containers since before the 1991 Gulf War. There was no evidence of any yellowcake dating from after 1991".
From the MSNBC link: Israeli warplanes bombed a reactor project at the site in 1981. Later, U.N. inspectors documented and safeguarded the yellowcake, which had been stored in aging drums and containers since before the 1991 Gulf War. There was no evidence of any yellowcake dating from after 1991, the official said.
This yellowcake had been there since before the 1st Gulf war and had been documented at that time. This is nothing new and does not let GWB off the hook.
Peace