So far I have found
22/22 Chests

Hotel:
- Next to sign of fast travel point

Gas station:
- Between car and dumpster right of building
- Tank left from building

Parts shop:
- Behind T2 / magnetite trailer
- On shelf above hoses
- Outside on the boxes between both entrances

Machine shop:
- Behind drill
- Right of dump truck
- Right of big excavator
- Behind Derocker

Blacksmith:
- Behind blacksmith building
- Workshop left from blacksmith building

Pine Valley claim:
- Entrance (barrier)
- Shed left behind entrance
- Fallen tree several metres behind gold tent
- Right side of gold tent
- Behind house (backside facing to hogpan pit) between gold tent and selling area
- Behind hogpan pit
- Pipe from river right from selling area
- Further side of big pit -> grass
- Further side of big pit -> river
- Ramp / hill south of pit