Masking isn’t a necessity at all, so I’d skip it altogether and just clean up with a little cleaner and/or a damp cloth. (I’m a fan of orange hand cleaner, and the “Awesome” cleaner from the dollar store, but there are a lot of other good ones out there.) And I’m going to guess the masking won’t stick because of an oily finish on the box which means it’ll likely be a breeze to clean up.
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