In the episode it is revealed that Meadwad's "real" name is Ryan, Master Shake's "real" name is Flint, and Carl Brutananalewski's "real" name is Lars. The episode's premise is that the three of them are deep cover agents, with "Ryan" and "Flint" on one side and "Lars" and Napkin Lad on another.
After the ATHF escape down the emergency tunnel at the last minute, they end up in a bunker under the house. The boxes to the left of the shot in the bunker are "Meal, Combat, Individual" rations (issued 1958-1980): the "Beans and Frankfurter Chunks in Tomato Sauce" with B-2 Unit ("Hardtack Biscuits and Cheese Spread with Fudge Disc"). It also came with a D-2 Unit ("Poundcake in paper wrapper"). In real life the box would be rather small and rectangular and would be packed in a wire-bound cardboard box of 12 different meals.