I remember you need to put one of the "common" daggers that you should have found underway, in one of the nishes that opens after you press 2 or 3 buttons nearby. The nishe closes, though after pressing the buttons again it opens again, but the dagger is gone. You can either find the jeweled dagger or the silver chalice, but not both.
Just walk along all the walls again and watch for not noticed before buttons etc. There should be a chest somewhere with the jeweled dagger in it, if I remember correctly. Don't know anymore where you can find the chalice, though.
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