Safecrackin'

Level 1

 * Fort Cowardice (Inside the Fort, Medic Tent)
 * Kole Ridge Mine (Inside the Mine, 3rd locker)
 * Stearns Ranch (Cellar)
 * A random encounter in region B
 * A random encounter in region C

Level 2

 * Old Millinery (Office)
 * Reboot Hill (part of the Tombstone Puzzle)
 * Fort of Darkness (Surplus Tent)

Level 3

 * Jumbleneck Mine (Foreman's Office)
 * Silversmith's House (Inside)

Level 4

 * There are no safes at level 4

Level 5

 * Inside the Stolen Train (Encounter 1)