You never want to trap moisture. Out in circulating air is the best, it allows moisture to evaporate. You will never see a museum store a firearm in a foam case, unless the atmosphere is totally controlled.
Putting a plastic cover over a car guarantees that moisture will be trapped underneath. A sealed gun case is the same thing.
Putting a plastic cover over a car guarantees that moisture will be trapped underneath. A sealed gun case is the same thing.

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