Plastic on Tins?

If you are talking the outer plastic wrapper on the package I would take it off, for one reason to inspect the cigars if there is a problem with them its hard to take them back later. also they will get the Rh in the humidor when you don't have the outer wrapper on. If you are talking about the cello on the sticks them selfs that is just personal preference I store them as I get them. hope that helps.
Josh