OP, please provide pictures of the shotgun and everything you received with it. Being computer saavy you might choose to highlight on the pictures what the problem areas are and what is wrong and missing.
Personally, I was taken once really well, and subsequently a few times afterwards but by then I should have known better. The major screw was back in the mid 70s when I dearly overpaid for a premium shotgun at a store in downtown Toronto aptly called "Skinners" and by nobody else but by Skinner himself.