This CIA toolkit is built for concealing in a spy's butt

Many years ago (when I was so young and life was (seemed?) beautiful!), my dad attended an internal med conference where one presentation showed x-ray slides of foreign objects jammed up peoples’ butts. He just had to tell us. One item was a tool box. A huge Snap-On tool box came to my mind (as with yours right now?), but life isn’t a Ren & Stimpy cartoon, so the object must have been one of those small elongated affairs you sometimes see at the hardware store checkout. Still…