I knew, I just knew you would have a good idea, John!
This may sound silly given, again, the goal that most have is to keep humidity low, but I'm tempted to just put a bowl of water in the safe and let it slowly evaporate. It would take quite a while this time of year and presumably add just a little humidity to the interior. Thoughts, anyone? Seeing those "new" cracks in such a nice rifle is killing me. I'm quite sure they'll close up and disappear once I'm in a more humid environment (at least I hope) but for now it's murder!