Kadox 20 (SHIF+E, Supplies > tools > Shiocl) are the pliers for 19 (chest in a Bandit camp).
When wearing the pliers (don't have anything in your left hand), mini chests appear locked (they stay locked).
Go to a bandit camp (kill them all), stick to the mysterious chest, take the pliers to force it (MAJ+E: Supplies > tools > Shiocl) and click on the mini chest corresponding to the area (50, 100...).
When the chest is opened, jars/Bings also appear (1 in zone 50, 2 in zone 100... 5 in zone 250). The chests contain zone-level equipment, the jars materials generic or special, dappers, plans (muse lam, dex...), Kadox tokens.
Last but not least: