How do you do the mission the case of the missing coins?

Answer 1

First talk to rookie,then he will close the door and can't get back in,then go into the staff only room and click under the couch and grab the CD then the paper clip,then go on the computer,put the disk in and turn on the computer, cluck on my files then combination number n stands for north and I think u can figure out the rest of the letters type them in on the vault and go inside talk to rookie answer the phone call and go to HQ talk to g watch the screen talk to g get the key to the roof in the drawer he opens and decode it