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Dried mushrooms generally last for a long time with one exception - insect infestation. I had a large bag or dried porchini mushrooms get infested with some kind of almost microscopic little bugs. I tried boiling them, but the mushrooms had an almost "digested"texture and I had to throw them away. Since then, I had another mushroom purveyor tell me to store them in a ziploc bag in the freezer and they will keep indefinitely. No problems since.
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