It is possible that MP rations are not only sealed like an MRE, but irradiated as well. Fresh meat that is irradiated has a room temperature shelf life of about 2 years. Fresh vegetables about 6 years. It wouldn't take much handwavium to get those rations to survive 10-20 years that way, which would be the esitmated time assuming Prime Base and Back Up Prime Base (need a catchy name for that) remained operational as planned.
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