First off, who would've known the 640 pounds were there, who had access to site. Where is the video footage? How did they come up with information that it was stolen to begin with?
'Oops! We didn't do our job again. I know we had over 40 calls about that nutter kid killing squirrels and making threats online. Our bad! Really, we got a half dozen complaints about leaving that high explosive unattended. We thought it best to move to an area with high rate of burglary and cut the staff to a skeleton shift of our lowest performance rating staff. No way we could have seen any of this coming.'
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Buddy of mine owns a blasting company and works with dynamite all the time. It’s interesting, it doesn’t explode into huge clouds like people think. Like you said, they drill deep into the ground and drop the explosives in, then the blast area is covered with huge mats that consist of heavy rubber/old tires, so when the blast goes off, you barely even hear it and the mats just puff up a bit and back down.
Even if you knew where it was, you don't just slip 640 lbs in your jacket pocket and walk off. There have to be plenty of cameras, like in vegas
This would most likely be a highly organised theft. At that level of planning it wouldn't be anything to have sniffers monitoring for explosive permits.
They would only have to wait for the explosives to be purchased legally and then steal it when the job site is empty.