Crowns of the Pharaohs: Missing Artifacts or Artistic Symbols of Divinity?

In Ancient Egypt, the gods and pharaohs were depicted with a crown, which, according to Egyptologists, was also taken into the grave for the afterlife. However, these crowns have never been found physically, neither inside nor outside graves. Did these crowns really exist? Could grave robbers have taken them all? Not all graves were looted before archaeologists discovered them and this strengthens the idea that the crowns were only used in depictions and statues, to indicate a certain, important phase in the life of a pharaoh.