Convert a document safe to gun safe?

I don't think a few holes in the bottom would allow it to breath enough. Being in TN, you probably have a pretty high ambient humidity as it is. Breathing in damp air won't help much.

What you need would probably be more along the lines of a desiccant system inside that wicks the moisture away faster than it accumulates.

To know whether or not it is effective enough, I would also get a humidity gauge/hygrometer with a probe that would go into the inside of the safe. Install it in before you install desiccant system to get an idea of the ambient baseline humidity in there.

There are a lot of reusable desiccant packs that are either baked in the oven until all the water is out of them, and some of them just plug into a wall and they heat themselves enough to dry out.

If you can create a relatively dry environment in there, it would probably be ok to keep a gun in it. I am guessing that since the moisture impregnated material can evaporate into the air inside that the amount of moisture in it is relatively finite, a good desiccant system would probably dry out the moisture completely through diffusion. Dry out the box enough and the water will diffuse from areas of high concentration to an area of low concentration, and in turn be absorbed by the desiccant.

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