I'm not worried about buying "grey market", the only concern is for the unknown batch code etched off, can't check if it's real and the production date. It affects the value of the product.
I already have dior dune, ysl la nuit, and a couple or other bottles with their codes removed or cut out from both box and the bottom of the bottle. This is grey market stuff and it's definitely genuine ( well mine sure is). The price seems right too, I'd say look around in that shop, they might have some hidden gems around which they got from the grey market as I myself scored M7,pure coffee and DHI vintage that way for little price.