If you have all four books - the character holding them can be asked to be a zenmaster at the dojo.
The door upon which you will use both keys is - hope I can describe this so you have some idea where I am talking about - from the room that holds the inner pyramid - go west back to the main area and go south. Was this the room you were calling an ankh? The door will not open until you have touched the portal of Isis, which if I recall correctly is further west from the inner pyramid room. Hope that wasn't too confusing.
If the chest you describe is the one also in the firey room - it is difficult to reach but not impossible. Took me a long time to finally get to it and I was disappointed by the treasure there in. Treasure can often be random, so maybe you'll find it worthwhile.
Wyv
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