They did finally auction off the Yellowcake around 2008 to a Canadian mining company.
1981? That's not evidence of what the Iraq were doing in 2003.
Also, the IAEA refused to let the U.S. remove 500 tons of Uranium we found.
It looks like that was eventually sent to Canada. The argument is that it wasn't "weapons grade." I don't know how to assess that.
If possible weapon-making material is there but isn't processed and there's no ongoing project of making weapons, then are there WMDs? Is preemptive war necessary or advisable, given what the costs would be?