Why was Booth admitted into the presidential box?

[loetar44]

Find A Grave contributor Mark Samuels placed this photo of John Frederick Parker on Parker’s memorial page. I always thought that there were no photo’s of Parker existing. Wonder if this is the right John Frederick Parker. Wrote Mark Samuels an email asking to reveal his source.

   

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Account of Dr. George B. Todd: "About 10:25 pm, a man came in and walked slowly along the side on which the 'Pres' box was and I heard a man say, 'There's Booth' and I turned my head to look at him. He was still walking very slow and was near the box door when he stopped, took a card from his pocket, wrote something on it, and gave it to the usher who took it to the box. In a minute the door was opened and he walked in"