List of Ford's Theatre Attendees

[RJNorton]

"Nearly one hour before the commission of the deed the assassin came to the door of the box, and looked in to take a survey of the position of its occupants. It was supposed at the time that it was either a mistake or the exercise of an impertinent curiosity. The circumstance attracted no particular attention at the time."

The above is what Clara Harris said a short time after the assassination. I have always been skeptical of what Clara Harris said. Now that Joe is working on a list of all those in attendance at Ford's has anyone come across another eyewitness account that JWB did indeed make a trial run an hour before the assassination?