Palworld copper keys are used to open certain treasure chests that you find around the world, offering randomised, and decent, rewards that can be especially transformative if you're in the early phases of Palword. If you want to pop open all the treasure chests you can find, I'll explain where to get Copper Keys in Palworld and how to use them effectively.
Where to find copper keys in Palworld
The two main ways to get copper keys in Palworld are from the yellow loot chests you can find scattered around the world that you can open without needing anything, or from defeating any general Syndicate enemies you encounter. Because they're part of the general loot pool of what drops in these cases, it can be easy to miss when you get them, as the notification appears on the left of the screen along with any coins, resources and Pal parts you might pick up. If you're in the middle of a fight you can be forgiven for missing the 'Copper Key x 1' that pops up occasionally in Palworld.
As picking them up is entirely a random drop, the only real way to get a copper key is to search out those yellow chests you can open without a key, and Syndicate goons to kill. From my experience the Syndicate enemies are probably the better option here because they more reliably appear in certain parts of the map and are easier to find than chests, thanks to their health and names popping up from a distance to highlight them.
So, assuming you find enough chests and tackle any Syndicate enemies when you see them, you should have plenty of copper keys to keep you topped up. You can also get them from raid enemies that attack your base, but that's a much more periodic event you have to wait for, so it's best to go out looking for them if you're in need.
For more resources, check out how to get Palworld Ingots en masse, or fill a bucket with Palworld Pal Fluids! (Ew)
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