Kingdom Death 1.0 (1.5?) - Box Corner Support
Created for Kingdom Death 1.0 box...might not work in the 1.5 insert but I do not have it and thus am not able to confirm or deny. There is now a new part I've trimmed, but without a 1.5 insert to test in I cannot confirm it works...proceed as you will.
Print out 4 of these, jam them into the corners of the box, put the game board on top and smile at your non-bent card dividers :)