These threads have almost got me wishing I'd kept my blue sparkle Squier Supersonic.
i miss mine as well(technically my girlfriends) , we sold it last year

if he followed my method for rolling the edges it involves a very sharp stanley knife or razor blade
gently scr@ped back and forth between the frets
You hold it really lightly and start with the blade edge almost touching the face of the fretboard and roll as you go
you can just do it with sandpaper but i find the scr@per easier and quicker