Is my Briggs and Stratton crankshaft usable as is? ?

I forked up and started a brand-new B & S engine without checking the oil first. Never mind why, I thought I had already checked it and I was busy, preoccupied, and pissed-off at the time and just messed up. So I tore it down and the only problem I found was the connecting rod was scuffed up badly enough to be unusable. The engine probably only ran 6 or 7 seconds. The connecting rod looks to be some sort of mag alloy. There is a new one being shipped, but my question is.....what about the crankshaft? The crankshaft is much harder and it appears smooth but there is visible marking from the shot connecting rod. Am I going to be able to go ahead and put it back together and use it if it isn't visibly flawless? Are the markings just cosmetic, or do they indicate structural damage to the steel? Any way to buff it without having it machined? Thanks for helping me out with my snafu.