Is this cone nut in proper condition? This is the original cone nut of a new coaster brake hub I bought recently. I didn't install it yet, it's new.

What bothers me are those weird stains / corrosion signs on the bearing surface.
It looks like the chrome plating is damaged (or whatever plating is on them) by corrosion (caused by improper storage conditions?), or physical damage (over tightening?). Just my speculations.

The camera/contrast settings might make it look worse:


Video (for different angles / light reflections):

                
            

Is it a good idea to just ride it and recheck its condition after a couple of rides? Or will it just fail right away? Can I polish it with sandpaper?
Update: It's been over a year since I posted the question and I rode ~1000km on that bike. I had no problems with the hub. The cone looks better now, and performs well. I believe there were just some stains on the surface.

Here's a picture of it now, cleaned and degreased. I left the dust cap on now, because last time I took it off it was a pain to put it back on. I think the imprefections on the bearing surface are being accentuated a little by my camera's default edge enhancement algorithms; with the naked eye they're less visible.