Firstly, I'm sorry if this is the wrong place.
Secondly, slight spoilers ahead if you aren't very far in the game.

I'm referring to the Bunkhouse with the safe in the area when you're leaving after killing High Overseer Campbell. Originally I wanted to avoid triggering the event in which the one Overseer is forced to kill his friend because I've heard that if you allow NPCs to kill each other, it counts against the "Clean Hands" achievement, but it seems that if you enter the area with the safe, the event triggers. I was hoping somebody knew of a way to either keep the event from triggering AND get to the safe, OR take the Overseers out non-lethally without being noticed.

EDIT: Figured it out.
If you're wondering: Just go to the roof and break the glass before the event triggers then go in while they look around.

Watching the event wont break clean hands, clean hands is only broken if their death is caused by something you had direct involvement in (ex: throwing an unconscious body in the water or luring guards into a pack of rats)

I left the one chick's uncle knocked out on the ledge of the roof and apparently he died. Must've rolled off in his sleep or something xD Anyway, it made me mad, but the game still said I didn't kill anybody.

woke up "Im falling!!!"

This is spoilerish enough, I will move it to the right section.

I couldn't find the safe... It's probably somewhere obvious >_<