As I understand it, IN, NOT IN, or BETWEEN work essentially like the MySQL operators of the same name. They are just abstracted somewhat.
However, it sounds to me like you don’t need to worry about that. Your description makes me think that you are only worried about the meta_key itself and not any particular meta_values or range of values, which means you can just use a simple meta_key argument (Look for “Simple Custom Field Query:”)
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