The NY Slimes ran with the story in 2014 detailing the injuries to US servicemen who chanced across the caches of mustard agent and sarin. The Slimes later published the US intelligence report on the events, released under FOIA. It's even been noted on Wikipedia that "the total number of munitions discovered since 2003 had climbed to 4,990...."
The Daily Beast later reported that Bush administration insiders claimed that it was Carl Rove's idea to cover up having found the weapons for fear it would spark an Muhammadan terrorist scavenger hunt to find others the US might have overlooked.
If you want to argue that "4,990" isn't adequate to be real WMDs, now you're argument falls apart as just splitting hairs.
INCORRECT.
Weapons of Mass Destruction was a disinformation "term of art" created in the USSR in 1937 to try to stigmatize any weapons system being built or employed by an enemy that they could not match in the effort to motivate the enemy nation's populace to exert pressure on the government not to use such a weapon for humanitarian reasons.
And in 1937, there were NO NUCLEAR WEAPONS.