I've had the same problem with Mainstay rations. I thought I was saving money by buying the 3600s. I noticed right away after it happened so I wrapped them in wax paper and put them in the freezer. Now I take them as disposable rations when I go hiking or fishing. If I need them, fine and if I don't they get tossed when I get home.

+1 on canned food. The one emergency food I stash which I'm certain will survive over everything else in the bag are the smoked oysters. Packed in oil so if I'm really down on energy I can drink it for the fat it contains.