Edit: Mystery solved. This item is the spare bit holder for my Dewalt power screwdriver. It must have come loose as I was preparing everything for assembly and gotten mixed in with the Onefinity parts!
I asked support and they didn’t recognize it. I think it was in the X-Rail box, but I’m not sure.
It looks like a add on clip you put on top of your drill that holds bits. Maybe it fell off one of the guys drills that was assembling. I would say for almost certain that is what it is. Snap it on your dewalt drill and you’re good to go. LOL