In The Sewers You Will Find A Safe With A Note, If You Break The Bottles Next To It, You Will See The Code : 451

In Doctor Galvani's House, You Will Find A Safe On The Second Floor, The Combination Is Written On The Third Floor In The Lab, Its : 287

In The Kennels, You Will Find A Door Locked With A Combination, The Combination Is : 217

In The Backyard, You Will Find A Bunkhouse, Guarded By Three Overseers (Two If You Wait For One To Be Killed), In The Bunkhouse You Will Find A Partially Collapsed Safe, The Combination Is 203, Take What You Want, And Good Luck! :)

If You Get The Key To The Art Dealer's Home, You Are Greeted With A Safe, The Only Way Of Knowing The Combination(s), Is By Asking Him For It, The Combinations Are : 138, 656, 679, 696, 879. It's Always Randomized.

In Pratchett's House, On The Very Top Floor, You Will Find A Safe... The Combination Can Be Gotten By Looking At The Paintings, Each Painting Has A Number On It.
The Combination Is : 437 Or 473

At A Destroyed Building, You Will Find A Painting Of Lord Regent (Ugh), You Can Open The Painting Revealing A Safe, Save The People Beneath The Building For The Combination, The Combination Is : 294

In Lord Regent's Bedroom, You Will Find A Safe, Talking To The Broadcast Announcer, He Will Tell You The Combination, Its : 935

If You Search Underwater, You Will Find A Safe In A Building, The Combination Is : 428

At The Sewer Entrance, You Will Encounter Another Safe From Jelly.
The Combination Is Hinted In A Nearby Book, Its : 528

Thank You So Much For Reading My Guide, I Hope It Helped You :)