I've seen such a love note from TSA only twice.

Once was when I checked a roll-aboard type of bag leaving DCA in 2002. They undid the bolts that held its foot in place, and left the foot, the bolts, the nuts and the washers inside the bag, with one of their notes. I have no clue why a hollow piece of plastic became the object of such curiousity. But to be safe, I replaced it with a solid piece of plastic, using a length of PVC brick mould and screws. Four years and so far so good. So there. It is one tough bag.

The other TSA love-note incident involved the type of heavy flying discs used for "frisbee golf." Returning, I carried them on. Let me tell you, they caused quite a stir at the x-ray station. They showed me the images - opaque discs. Even knowing what they were, they looked downright evil on the xray image.