I do not have the same dings in my bolt as yours, (looks like yours was pulled from a pile of bolt assemblies), but I did notice from day one, my bolt looks as if it was hand-fitted with a die-grinder, and rather crudely. It works okay, and I suspect it'll be a non-issue unless I decide to do some final finishing to remove the rather grotesque tool and grinding marks.
Also today, just because of this thread, I looked at another American bolt at the gun store, just to see how the bolt looked. It was finished very nicely.
Leads me to think maybe there are/were bolt issues with some Americans, as Heliman Dave has bolt issues with his American requiring its return to Ruger.