No, we didn't.
Prior to the first gulf war (the one in the early 90s), Iraq had a chemical weapons program. After the war, that was shut down and most of their stocks destroyed. When the inspectors came through after the second gulf war (the one in the early 2000s), they came across old shells on which they found residue of chemical weapons, indicating that a decade earlier they had once contained chemical weapons. They found no evidence that Iraq had actually restarted its chemical weapons program, or had any significant stock of chemical weapons.
If you claim they found anything more than that, please provide a citation.