Well that's an inside job if I ever saw one. The thieves obviously knew what was in that truck, where and when it would stop.
I know I shouldn't be throwing accusations out in the wild, but to pull out a heist like that easily, you'd need the driver of the truck to be in on it. Giving intel about the whereabouts of the truck. Loading that specific pallet at the back of the trailer.
It's way too fishy. And now that the serials are public (counterfeiters are gonna love that), it will be very hard for them to sell them off in the US, so they're pretty much guaranteed to head overseas.
Just my $0.02, though.
I don't necessarily disagree, it was likely inside, but with all these mileage tattlers and online tracking for shipping logistics, seems plausible a truck could be tracked and found completely unbeknownst to the driver. I don't know where Gibson & Sweetwater are, but if you are long haul trucking anywhere across big chunks of the US, you're probably sleeping & showering in a travel plaza at some point.