*apparently
So I'm reading on Gamefaqs that the Knuckles of Eao works at the Gatekeeper. I haven't tested it personally since I've used them at Atheon so I cannot verify. But a user claims it's true
If it is indeed true this will come in handy for those looking for a Chest piece
In the same topic I also read this works at the Siege Engine as well (chest & arms iirc)
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Yes, they work at any encounter that drops rewards lol. Always use them at the encounter you want double rewards from and remember to read what the item actually does before you use it.