Need help with this:

You're a company accountant and you work in a banking role. You are handed the company's check stock to maintain in your possession, you are the one with the signature plate used in the printer to create checks / check signatures on the check stock, you produce all bank journal entries at the end of the month, and you make a bank reconciliation. Why is it a bad idea to give all these responsibilities to one person? What could possibly happen? What improvements would you recommend to the board, if any?