I received an "ammo case" (metal) as the container for my groomsman gift at a wedding a while back. It seems to seal fairly tightly, and I am wondering if I can use it as a makeshift humidor to store extra cigars until I decide on a real humidor down the road. I'm thinking that some sort of "gasket" type add-on to the lid to improve the seal, and one of those "humidity paks" I have been reading about should keep things okay in the short term, or am I just kidding myself?