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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).

mini chests appear, for different areas

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...).

Looter Bings

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

Last but not least:

if a homin has just made this chest, wait about 15 min.
some chests are buggy: at the source, the Wicked Winds (kill them, there are always some left).
there's also a problem with bonus zones: 150 zones are mistaken for 200 zones.