I probably could have let this go, but to make absolutely sure the frets were in top notch condition, it was time to level and dress the frets. First, creating flats with one file and removing scratches with the same file riding sandpaper:
The angled files were used to deepen the bevel on the fret ends.
After restoring roundness using another file and more sandpaper:
Tools for dressing the fret ends and sanding the board and frets (not the crayons):
It's looking pretty good to me. Final sanding and finishing are all that's left!