With the tilted hub doubling that theses coins had the doubling was small and light so I would think it would be possible to have the doubling removed by die polishing. I've never heard of a case of it happening but it should be possible. You would have to find a coin with identifying die features that are present on the doubled die and the exact same features on a die that doesn't show the doubling. This could be difficult because the same polishing that removes the double image would also likely remove the identifying features.
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If they were to do that it would leave a hump that would be as high as the device that had been doubled.
Dies are polished (lapped) across the entire die face not just in one spot. So the entire die face would be ground down until the doubled feature disappeared. The branches of the trees would get thinner, and the trees maybe slightly further apart. Sometimes they will do a little local work on a die but not so much as to remove a design feature because that WOULD leave a raised lump and defeat the whole reason for working on the die.