Lay a piece of sandpaper or emery cloth over the scratch, grit down, and tap it with a small hammer. Might have to experiment with grit size to get the best look. Not as good as having it blasted but will hide some marks.
I've had some good luck with an artist's gum eraser. Nothing will make it look exactly how it was, but it knocks the shine down to match the rest of the finish.
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