Not really. I've tried polishing hardware on Legacy bags and it makes it look worse. The brass is just plating so any polishing could remove more of the plating. There are places where you can the brass replated. That would require removing the hardware. You might be able to find a new turnlock to replace it cheaper. There are screws on the back to remove it, rather than the tabs of the classic turnlocks. I've never removed them. I just noticed the protective plastic is still on the hardware on my Bridgit!
Personally I wouldn't let this bother me.
Good to know - thanks!