Everything looks legit. If that shipping box has the watch’s serial number on it (I see the ref number is there) it could actually be neat to have it included in the package if you ever go to sell the watch. Not saying it’d add a ton of value or anything, but it definitely ups the ante on the idea of a “complete set.”
IMO that’s just about as perfect as a wristwatch gets. Goes with a tux, goes with shorts. You can swim with it. Perfect size, most comfortable bracelet Omega makes, and I doubt it will ever appear to be dated.