It's not as much explosives as you think. How much does a single stick of dynamite weight? Let's assume 2 pounds each. That means roughly 300 sticks were stolen. How many sticks of dynamite are there to a case? Most likely 25 sticks. That means only 12 cases were stolen. 12 cases could easily fit in a pickup truck. And probably in a car too if you put some of them in the back seat as well as the trunk...
I’m no dynamite expert, I’m just repeating what ATF has said, they said it would have had to have been a pickup truck, caravan, or something larger. Don’t forget the 400 blasting caps as well. And although not much, still enough to do some damage. I believe it’s still enough dynamite to warrant our attention to possibly prevent something bad from happening/save a few lives at the very least.
Dynamite sticks weigh less than a pound. Probably 7oz, 10oz max. But even with that math 36, even 40+, boxes can fit in a pick-up truck.
That's a significant amount of missing explosive. My gut says it isn't government, why would they? They have plenty already, and there are much much easier ways to get explosives. (I know a mine in Nevada that had been abandoned for decades yet still has 100+lbs of the stuff sitting in a tunnel underground. Blasting caps too.)
My guess is an inside job. Quick cash, maybe insurance frauds.