They did, but apparently there were much more there than was revealed for some reason. There were also the truck convoys that went into Syria and disappeared, some speculated that the most functional cream of the WMDs might have been on them. Was this ever addressed by the administration?
Freegards
There was never any doubt that Saddam had poison artillery shells, he had used them on the Iranians and the Kurds before Gulf War I.
Since we halted at the Kuwait border at the end of GWI we had to rely on UNSCOM weapons inspectors to locate WMDs and have them destroyed. Saddam booted the inspectors out in 1998. I don’t know of anything other than chemical shells being found by the weapons inspectors prior to Gulf War II.
The yellowcake removed to Canada in 2008 that has everyone’s attention today (Rush) was known about and wasn’t considered by us to be part of a WMD program. This is material that had been stored at the site of Iraq’s former reactors, the one bombed by Israel in 1981 and one we bombed during Desert Storm in 1991.
Yellowcake is a very long way from being bomb material. It is only mildly radioactive. You get about the same level of radiation from it that you do if you fly in a jet. It is over 99% U-238 but you need U-235 to make a bomb. There is a whole lot of processing required to get that tiny amount of U-235 out of yellowcake.