Misleading and inflammatory language. The missing items are check sources used to verify correct operation of the radiation detection instruments. The quantities are so small that they are considered exempt, i.e they can be transported and handled without NRC paperwork. Nobody is going to build a bomb, dirty or otherwise from these check sources. Nor is there any hazard associated from proximity to these sources.
If the samples/equipment stolen cost anything at all, they should have been secured. I travel by car a lot. I make it a point to never leave anything out in plain view to get stolen, even if I am just going into a store or restaurant for a few minutes. Guess what? I don’t have anything stolen. This just goes to show that you can always count on gubmint”experts” to screw up pretty much anything they do.