That is a little unusual - I agree with others that it looks like more than just a few test rounds at the factory. It could be somebody had it, used it a bit, and returned it; there is no telling.
But... I'm not sure it matters! If the gun otherwise has no wear, and it functions correctly, then it might be best to let it go. If you make a guess it was fired 50 times... it only has 49,950 left before it needs maintenance from S&W.
The lesson -- and I need to remind myself of this, too -- is to inspect a gun before picking it up at the LGS. Really go over it for mars, nicks, etc., as well as wear (smilies, shiny spots, worn lands, excess powder or dirt, etc.).
Mention it to Academy? Why not? What remedy do you want -- to return it? I don't think you need to do that, but telling them you are not happy might make them cough up a discount on something or whatever. Good luck, enjoy the pistol!