Though Tutankhamun could have been among them, the Egyptian authorities made the decision to return him to the Valley of the Kings and he now rests once again in the inner sanctuary of his tomb in a stone sarcophagus.
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Tutankhamen rests in the Valley of the Kings, as per the request of the Egyptian authorities.
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Tutankhamen was released by authorities, so his sarcophagus would be part of a museum display.