You will be able to get extra ghost shells in future dlc's. At least one guy has already been banned for glitching into a non-released dlc area and picking up a dead ghost that gives you a ghost shell.
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Picking up that dead ghost does not give you a ghost skin. He was not banned for glitching into any area.
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I heard he was banned for picking up the ghost and getting a shell. Sorry for the bad information lol.