I think the biggest hint is “Nickel plated”. On the periodic table, Nickel is 28. 28 is one of the choices reflected in the mirror. The girl on the ceiling only shows the front of her face. That same portion of the face is being held by the statue. The gears shows 22, 33, 44, 55,66 52, 28. 28 and 52 are the only two that don’t fit the pattern, with 28 being the only choice. This may be wrong, but there are 35 B’s on the document. 35 on the periodic table is Bromine.
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