My bottle has the code "cut" off as well ( on the bottom ). I have no box. I am not sure how they cut into the bottom of the bottle as such, but they did.
That being said, my M7 smells wonderful ! I know it is just grey market and ( especially with a brand like YSL) the seller doesn't want what they sold to be traced. Chandler Burr's book The Perfect Scent explains this well ( better than me, at least).
keep your bottle and enjoy !