There's been a lot of chatter around the 'nets about that.
One TV station's video showed the "two ton" pile of ammo. Figuring 1K rounds per box and counting somewhere around 37 boxes I come up with 29 rounds per firearm. That won't even get through the opening credits of the zombie apocalypse.
Looking at the various piles of guns they laid out in the walkway so the cameras could see the "arsenal" I seriously doubt if the guy was collecting in the sense we usually mean.
'Scuze me now. I gotta go figure out where all my guns are stashed so I can count them, even though I know what the total will be: Not Enough.
stay safe.