I sent you the next saved game I have. This is after the Nefertari's children puzzle.
Load it and then do this from the walkthrough.
Open the second coffin. It's empty!
Decode the papyrus scraps:
Take the torn papers from inside the coffin.
Piece them together. Right click to rotate the pieces.
After putting it together, translate the hieroglyphs.
Learn that the true tomb is here.