For chapter 2, bank, I can figure out how to set the keypad to the graph on the computer on floor 1...

On page two in the folder, there is a bar graph with 5 bars. On the bank computer, there is a big key image with 5 numbers. When you tap a number on the computer, a little box will appear above it. Tap again, and little boxes will start to stack up. Make the stack of boxes match the bar graph to unlock the vault.