[T.G]

Because tupperware doesn't really breathe unless it has a poor seal, it can cause your cigars to become overhumidified if you aren't using a two way humidity device (boveda packs, heartfelt beads or HCM beads), but other than that, not really missing anything. The cedar can be added for aroma, but that's about all a thin sheet is going to do.

Not much difference between tupperware and a coolerdor when you stop and think about it and there are a great many of us that use coolers for short and long term storage of cigars.