It came in the box and we can’t figure it out.
I think it’s the packaging the holds the cables and such. Someone might be able to give a more “sure” answer.
I agree with @Greg. I had the same thing in my Piper kit & it held the screws & nuts and bolts (The stuff that held the Piper case together.)
Thanks. My kids got to the box before i did and i didn’t know if it was needed for the games, or if it was just packing material!