The Mask Of Anubis
Legend has it that when worn at the funeral of pharohs the mask would weep tears of gold. It is most likely the frobisher smythes stole this from the tomb aswell as the cup of ankh.
The frobisher gem needs to be placed in the hole in the mask so you can open the field of rushes. The fake mask could still have the gem but nothing would happen.
The Mask Of AnubisEdit
The Mask Of Anubis was found in the library because the one at the end of the tunnels was a fake.
The Replica mask was found at the end of the tunnels. Everyone thought it was the real one.