I have long held that Iraqi weapons went to Syria. I always believed the would re-surface in a situation like this, too..
Most of the weapons that went to Syria are about as likely to resurface as Saddam is to rise from his grave.
In Syria they have plenty of new weaponry and warheads, and factories that spit them out like cars on an assembly line, so why bother with fireworks that have been in the closet for TEN YEARS?