You and David make a good point.
My headline, and the first lines of the news story, are very misleading. The actual story, down in the text, says each container weighed 187 pounds. It's very likely that only a small percentage of that was cesium.
I should have caught that myself.
I'm also remembering a similar story a while back about a large amount of uranium that was found that, as the story progressed, seemed to shrink rapidly.