Thank you, aMorePerfectUnion.
So the pallets are carrying something very heavy and needs refrigeration.
I read that thread and it is excellent. It rules out gold because of the weight, not to mention there would be no need for refrigeration. I am going to check his feed later for updates.
That could be cell phones or cell phone batteries.
... although refrigeration may be a ruse...
... although refrigeration may be a ruse... or the small number of pallets were going to be infilled with a greater amount of frozen food items as cover...