That could be a weak point in the case against HGR. The prosecutors need to show the jury where the live rounds came from and how one of them got into the gun. JMO.
What if the company that provided the blanks made a mistake? How can any reputable LE agency not follow through on that? If they did investigate it and develop some evidence, where is it? Where is the report? That should be public information. JMO, the way this investigation has been handled seems a little hinky. I hope I'm wrong.