Some tips I learned from here
No straps or other moisture-holding accessories in the safe.
Goldenrod is best, but may void safe warranty as it requires a hole to be drilled.
Silica packs are what I use. They must be recharged periodically, but it is not much of a hassle. Put in very low oven overnight.
Volatile Corrosion Inhibitor (VCI) chips, or bags work pretty good too, I've heard.
Regards.
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