terraforming mars cardboard map box big box extensionNOTE: This is not the Big Box itself, just the EXTENSION of it, and an extra insert, to give space for the newly released game content. You need a Big Box to use this. Contents: 1 Extension Piece to expand your Big Box 4 cardboard pieces to build support in your Big Box Lid 1 Insert to hold new game material 2 Deck Boxes, each able to hold approximately 100 sleeved cards. 1 Insert Lid to replace the old lid that held the game boards.