[Nuttyman54]

Maybe it's materials for a "build-your-own sizing box"? They did say big changes could coming. Qty 4 of 60" lengths of 1"x1"x 0.125" aluminum angle comes in right around 5.5lbs. That's the amount you'd need to build a nominal cube sizing box 28"x28"x28" with an open bottom (4 horizontal lengths make the square base, plus 4 vertical legs). Maybe some corner connectors are included

It expands on the recent changes to the 112" perimeter rule. Now you would make your sizing box whatever size you want with the material provided. Bring it with to inspection, show that your robot fits.

Crazy? Yes. Cumbersome? Definitely. A good idea? Almost certainly not. But it checks all the boxes (pun intended):
-Required for every team
-Cannot be packed in a shorter box
-Multiple items
-6lbs
-Big change