Don't be silly. It's just one shell the Iraqis accidentally found in a dump. They didn't know what they had or what they were doing. < /sarcasm >
Bingo.
I heard Blix explain it and after that its SO clear.
It was scavanged from a non-existent stockpile which contained old substance which had long since deterioated. I infered from that then is the substance must have been replaced with fresh chems from the non-existent chemical program by the jihadi's who had no idea what it was they were doing. ;-)
At this point I figure the only explination the left will accept is the shell spontaneously assembled itself from various items lying around the desert.
"Hey Achmed, did you hear the news? We need to go back and get some more of those shells with the blue tips!"