The safe codes in the Modern Warfare 2 campaign mission “Alone” are:

  • First safe (coffee shop office): 10-10-80
  • Second safe (workshop/garage office – “El Maistro” door): 37-60-80

These codes are the same in every playthrough, so you can just enter them directly to get the pistol, throwing knives, and other gear that make the stealth section much easier.