Customs

The victim had handled thousands of parcels in the time frame to still have that much residue left on his body. The last night that he worked, he moved a large shipment of boxes for distribution. I suspect that it was these boxes that held the uranuim. There would only be small amounts per box, but each one going to the same destination.
Trouble is, they all went to different places. There were at least 8 different trucks taking the parcels in different directions, making deliveries as they went along their routes. So how can we be sure all of these boxes held some of the Uranium? We can't. The cardboard exterior to the boxes would be gone by now. And it's more than possible that there was only one or two boxes that contained a threat - the others may have just been standard parcels.
With nothing else to search, we left the station.

Julian has gotten everything ready for Arthur's induction. We're going to be needing all the help we can get. But we've never actually inducted anyone before - everyone so far to be part of our organisation has been literally born into the role. But now there's only three of us left here, and eleven globally, meaning times must change.