Speaking as an archaeologist, I can attest that corn kernels, beans, squash, and various other plant seeds can survive for hundreds of years if they are kept, dry and in the dark (buried) even without special packaging. Don't know how they would taste, though - we generally had better breakfast options. Sealed in a cookie tin and replenished with brandy, you ought to have something really fine....
Meat products didn't do nearly as well, even if dehydrated.
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Geezer in Chief