This photo was found inserted inside a book on Abraham Lincoln published in 1901 that Dr. DeSalvo found at an antique shop. Below is the caption that came with the photo.

  The Stage of Ford’s Theatre

From a rare photograph, never before published, made immediately after the tragedy, the flag torn by Booth’s spur still hanging before the President’s box. Many have supposed that John Wilkes Booth sprang from the stage into the President’s box on that fatal night in 1865. This rare photograph, never before published, graphically illustrates the story. It shows that the boxes were on the stage within the procenium arch and high enough up to be on a level with the gallery. It was an easy matter for Booth to come through the passage way, open the door to the box, observe the occupants, commit the deed, leap to the state and disappear. And that is what he did. The flag which caught Booth’s spur and threw him became the “mute avenger of its country’s chief.”