Wouldn't it be more of a problem putting a *cold* gun in a case that has moist air in it? Kind of like when you go outside on a humid day after being in an air-conditioned building and your glasses fog up? Moisture doesn't condense on an object that's warmer than its surroundings.
I do see your point that a case that's been lying open outside is likely to have more moisture than a case that's been sealed up sitting on a shelf, though.
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