We haven't done "boots on the ground" in Iran and even if/when we do, unless we have a map with the "X" marks the spot to look, we might never know for sure.
Iraq experience provides some examples to go by.
First was the signs of truck and air cargo traffic out of Iraq and into Syria which many in Intel that was Saddam removing evidence and/or components of WMDs. Whether biological, chemical, or nuclear was never clear at the time and to date it appears uncertain where those shipments went to and what they were. Alternatively some claim the shipment was the other way around, the transport was of weapons out of Syria into Iraq to bolster Saddam's military armament.
Second is the discover at Iraq airbases of combat jet aircraft buried under sand on edges of the bases. Most were not properly sealed prior to burial so likely would have been difficult to restore to flying condition.
Third is discovery of Iraq battle tanks buried in the sand. I got this account from my oldest son who was in Iraq with 1st Cav Div from April 2004 to April 2005 on occupation duty in Sadr City - Baghdad. Seems a humvee patrol outside the city in some unplanted farmland had a vehicle bump a large rock with it's bottom skidplate. This being a flood plan for centuries, finding large rocks is very rare. Some digging revealed a tank turret, then the full main battle tank. Further investigations found close to twenty MBTs buried in that location.
My point in this is that there might be other stuff buried in Iraq that hasn't yet been found or revealed~told to us.
Also, that we haven't begun to explore Iran which is significantly larger that Iraq, so I'd hesitate to claim there is nothing to be found, when searching hasn't even begun.
BTW, one actual WMD we did find in Iraq was an environmental one. Saddam had blocked water flow to the Southern coastal marshes, drying out a large area of coastal wetlands and wildlife habitat. Also seriously reduced the food resources of the 'Marsh Arabs' who lived there and had a few thousands years culture of that lifestyle. Curiously this gets little mention or traction, especially from the environmentalist advocates.
www.theepochtimes.com
