Hi there stormincher! If you are at the safe puzzle in the Gatehouse, the book upstairs doesn't exactly depict the way that the buttons look, as I recall. But the graphic does give you a strong clue. If you have completed the other tasks required here, you probably just need to reposition the buttons appropriately.
WARNING SPOILER:
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Push and drag the square buttons to coincide with the length of the coded lines in the book, high , low, low, high, middle. The box will open to reveal a mirrored, red velvet compartment. And, inside it, the blue and gold crystal key. Click on the key to move it into your back pack.