Perhaps your coins did not meet the requirements to be crossed over?
I hope your coins did not meet a grader that was having a bad night? and you were the recipient of his bad judgement. It happens, I know that for a fact. I have never been employed as a grader, But I have looked at 18"x2foot deawers of change for almost 60 years, I know a good coin when I see it, and I know the detail when I see it. That being said, I have also had a few bad experiences with ngc, But they have always offered