What color box did it come in?
If it came in a red box, it's considered a CPO Sig, in which case it's a used gun that has been certified as 'like new.'
Clearly judging from the slide alone that is not a new piece.
Granted I'd take a used Sig over most new guns nowadays.
And Magazines people! Magazines! Put down the moonshine and talk like gun owners, not yokels