I use VCI paper. I put it in with my guns wherever they are, in a box, in a case, in a cabinet, in a safe. I haven't had any problems at all since I started using it. I'd think that you shouldn't have any problems if you get the plastic bags with VCI paper.
I posted a question here a long time ago about using VCI paper and didn't get any response, perhaps those who saw my question didn't know what VCI is.
Volatile Corrosion Inhibitor.
It's been used for years to store steel parts like bearings, shafts, etc. If it's good enough for steel parts manufacturers, it's good enough for me. (Especially for as cheap as I get it).
Technical info about VCI.
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