I bet they would have come to get it right away.
All he had to do was say something like ............
I bet my congressman will listen when I fire this baby today.
In the airforce world yellow = real thing and blue = training munition. The army could be different but I'm not sure.
I would have cleaned the sucker up and kept it in the garage. lol. He did the right thing though by turning it in. I want to see where/who it ends up being tracked to.