Object
The coffer
The red granite box in the King’s Chamber, about 2.3 metres long, with no lid and no inscription that Egyptology has recorded.
Emőke Dénes, “The Great Pyramid of Giza”, CC BY-SA 4.0, via Wikimedia Commons
No body was found in it; the pyramid was open by the ninth century at the latest and probably in antiquity. Petrie measured saw and drill marks on it and used them to argue for copper saws set with hard points. It is called a sarcophagus by analogy with other pyramids. Grant prefers “stone box” and points to the absence of a mummy as an open question. Both are fair descriptions of the same object.