You enter the SEQUENCE OF NUMERALS from the PIECE OF PAPER. The combination works!
However, instead of opening the safe, the dial has simply popped open to reveal a keyhole. It looks like it requires a key that looks more like a house key or a car key, rather than one of those old fashioned looking keys which tend to be littered all over video games, and which you are quite sure you have never once seen lying around in your office.
You don't need this PIECE OF PAPER anymore.