Slight misunderstanding here.
The amount of cesium 137 in the sample was never mentioned. The notion that it was ALL radioactive is implied but very unlikely to be true. A lump of that much Cs137 would melt its way out of any container is short order by its radiogenic heat.
An accurate article would have described the quantity in curies not in total mass. Since nobody does isotopic separation on Cs137, the vast majority of the stuff was probably harmless.
I am not trying to make light of the potential problem, but just to put it into perspective.
But, it is another reason NOT to let up on our worldwide attack against Al Qaeda until it has been eradicated completely.
