I don't know what effect putting the humi in the freezer would have on the wood. I'd be leery of that. Temperature extremes like that might damage it.
The cedar lining repels the beetles. I would just wipe it down real good with distilled water and let it set for a few days then examine for beetle turds. From what I understand they will smear when you rub them as opposed to tobacco leaf flakes which will not.
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