which symbols in which order to press on the owl casket.
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I've listed a couple of hints with breaks in between so you can be choosey about how much help you want.
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The park bench told you to open the owl. The bit of graffitti showed an infinity symbol being the key to the owl. Where have you seen an infinity symbol?
It was near the park bench.
The riddle on the monument tells you the order to press the button in order to open the owl.
Of course, you need to be able to read Chinese numerals.
The open book in the professor's office tells you what all the symbols stand for.
Solving the riddle on the monument is just good brain exercise, but if math isn't your thing, use the camera, take a photo and show it to Tiffany.