Why was Booth admitted into the presidential box?

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After prof. William Hanchett re-identified Forbes in 1984 as the man who let pass Forbes, a complete change in views was set in motion. (The late) William A. Tidwell in “Come Retribution” (1988) and Edward Steers, Jr., both seen by me (beyond any doubt) as excellent scholars and both widely recognized as authorities on the Lincoln assassination (like Hanchett), also support the Forbes-story. I see Hanchett, Tidwell and Steers principally responsible for the Forbes-story. Of course their conclusions are based on extensive investigation of archives and original documents. I hope that I don’t ask an inconvenient question, but Mr. Steers, as I’ve learned member of this symposium, please can you shed some more light on the Forbes question?