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Sealed containers can rupture, sometimes violently, from the out-gassing that occurs as a battery melts down. The box I use is fire resistant but there is no rubber seal.

They sat on a shelf, somewhere, in that carboard box for a good while before they were shipped to you... nothing inherently dangerous about a balanced LiPo pack... that said, whatever makes you sleep easy. I keep mine in a metal box, because it makes me happy. :happy...