Our world is a land without magic, but that doesn’t mean it has no magic in it. Regina still had her crypt of magical objects and beating hearts. Graham’s heart was glowing so it had some magic attachted to it. And if Hook is in Ouat, that means Peter Pan and Tinkerbelle aren’t far behind. Both Peter and Tink visited our world. So I’m not ruling out something magical was in the box.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.