First off, thats a pretty cool idea. Secondly, I think before you put time and energy into worrying about mold, you should worry about it holding a proper seal. See if it is at all possible to create a lid that will seal out of the cigar box lid, because if it cant contain a proper environment, there is no use in putting more time and effort in a lost cause. If you do get this worked out, post a few pics of the project!
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