Level 10 hidden items:
Hidden items can be found in the following locations:

-On a shelf in the back left.
-Below the stack of books at the left edge of the screen.
-The golden toucan statue is sitting on one.
-Behind the stem of the large goblet in the middle of the bottom edge of the screen.

Cube location:
Look above the golden mask to the left of the sarcophagus. It is a bit behind the mask, and the top edge of the cube is horizontal.