Later in the war, the US changed the packaging on their K rations in order to improve morale, with snappy designs on the same food. These boxes contain no food, but are perfect for your display.
The box says: Dinner Ration Type K Open Inner bag carefully. It may be used as a waterproof container for matches, cigarettes and other items. For security, hide the empty can and wrappers so that they cannot be seen.
Cheese: should be eaten cold. Assorted Biscuits Confection – Beverage: Sugar – Chew Gum – Cigarettes – Matches – Salt Tablets