How do I know which Key matches which Box?

Firstly, the Key name follows the name of the Box you can open with it.
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Additionally, there are several ways you can use to check the Key compatibility:
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A. Once you are in the Key Ring section:
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- click on the "i" information icon next to the selected Key.
- the relevant Boxes are mentioned in the "Openable Boxes" area.
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B. From the selected Box page:
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- if you have a matching Key to open the box, the button “Unbox for 1x Key” will be active.
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C. From the Boxes page:
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- use the sorting by "Keys (available first)" option.
- the Boxes which can be opened with the Keys you have in your Inventory will feature a "Key available" sign.