Iraq didn't have them.
The reason they didn't have them was because Saddam got rid of them
The reason he got rid of them wasn't because he was a good guy. He simply thought the easiest way out of sanctions was to get rid of them but keep the ability and knowledge to build them. Then inspectors would find nothing and sign off on getting rid of the sanctions. Once that happen restart his programs and start making his fun stuff again. I am also under the impression you're supposed to replace your chemical weapons every so often anyway because being caustic also means you can't store them forever.
Their idea of an offer you can't refuse is an offer... and you'd better not refuse.