Did you notice the box in the corner of the room? Turn around with your back to the sarcophagus and look to your left.
Inside the box you'll find four containers with animal heads; these are canopic jars, which the ancient Egyptians used to hold a mummy's organs, ew. But if you open them --
-- you'll find that each one contains a disk with a picture of an animal or person on it. Huh?
You'll have a better idea of what to do with them after you solve the scarab puzzle in tunnel 3.
How do I solve the scarab puzzle?
How do I solve this panel with the disks?