No NGC grade if box is opened?

I can not believe that we can not get our coins graded as the set, "2oth Anniversary Silver Eagle" if the box was opened. How are we supposed to make sure the contents where to be what they where and to make sure they where in decent condition. Especially with all the hype about "OPENED" coins from their holders. So now I've will not send them in to be graded because they will come back as only ONR saying that it is part of the 20th Anniv set.....not fair.