On that you are horribly wrong.
http://www.foxnews.com/story/2004/05/19/tests-confirm-sarin-in-iraqi-artillery-shell/
The Sarin IED, one of SEVERAL, were of a binary mix in flight type of shell that Iraq did not have prior to 1995.
The shells found used as IEDs contained so much liquid intact may be telltale as I understand the main sarin component is too corrosive to store in shells for long.