How to identify counterfeit Shimano parts?
If you are really interested you could contact Shimano directly, say that you bought them, that they do not have adjusting hole, and that you suspect they may be counterfeit, and if they could advise you how to check it. I suppose they would be happy to help you out since it is in their interest to find and fight counterfeits.  

But you could be looking at the wrong instructions (like year of production). Parts could have originated from some new bike, that was upgraded in the shop with some higher spec parts, and originals got sold this way.