If it turns out what you saw was rust -- probably wasn't -- you should understand that storing in a plastic bag can keep moisture out, but can also lock moisture in, if the air is humid when you close the bag.
Getting some of the little "stay dry" (dessicant) packs to go into the plastic bags also makes sense. You can buy them from some gun shops, and you'll often get them free, as they often come in packages when you receive gun/electronics gear from an online store.)
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