You found the one file the Department does not discuss. Since you are here, and since you clearly went looking, you may as well know what is inside.
Field Note
"People ask why we don't display it. We tried, once. A visitor looked at it for a long time and started to cry, and could not say why. We put it back in the drawer. Meaning, it turns out, does not need a frame. It just needs to be kept."