If you look at the tag real close you notice a few things. There is a tape line on the tag where there is still paint on the tag. It appears they taped around the tag and applied paint remover to the tag. Also is a flap of paint in the bottom left corner, paint from the tag? And paint remover would explain the spots on the metal tag. My opinion is it has not been removed, the revits holes have paint flakes from the paint remover or sealer from the factory.
Roger