alright! you’ve successfully opened up the safe. good work!
inside it you find an envelope. and next to the envelope is a printout of some sort of map.

the content of the paper inside it might reveal something that is hidden and unknown. but you’ve already made it this far, so i dare say, by now it is nothing that can stop you moving forward. at the back of the note there is a single sentence and a bunch of numbers listed:
you need to go.
42, 71, 69, 11, 19, 22, 37, 22, 42, 19, 11, 36, 42, 73, 101, 92, 12, 77, 15, 22, 33, 44, 55, 66, 77, 88, 99, 42, 73.
you get a distinct feeling that this is more important than the map, thus, you choose to solve this mystery first.