It wouldn't be a single line of code because this "ultimate box" does not exist in the game as an entity. These boxes are just models with a script attached that lets people access their inventory. The USBasicWeaponsBox is a predefined box with a list of items already scripted in it. If you want to execute a local spawn of a box with all of dayz's items, you would need to have a script that adds every item to the box's inventory.