Mary Lincoln's engraved opera glasses?

[Linda Anderson]

Anthony Pitch wrote in They Have Killed Papa Dead that Kent found Booth's pistol in the box and gave it to Lawrence Gobright.

Pitch's sources are:
Gobright, Recollections,
New York Herald, April 15, 1865
Kent's testimony in both the conspirators and John Surratt trials
Kent's statement, April 15, 1865

What's interesting is that Pitch also included as a source:
William Kent to his mother, April 15, 1865, typescript of lost original letter, provided to the author by Kent's great-granddaughter Virginia Brown.

Pitch also used Kent as a source earlier in the book when he (Pitch) wrote that Laura Keene had pushed through the crowds and carried a glass of water to the box. "When Leale granted her request to cradle the president's head, she sat on the floor and gently caressed the sad face. William Kent looked on in horror as bloodied brain tissue appeared to ooze from the dying man's head wound onto her lap."

Pitch wrote in his acknowledgements that "After C-SPAN filmed my tour of Lincoln assassination sites in Washington, I received from Virginia Brown, in Florida, a typescript copy of a letter written by her great-grandfather, William Kent, who had helped cut open Lincoln's clothes in Ford's Theatre moments after the shooting so a surgeon could look for wounds. Later that night Kent returned to the president's box to search for his mislaid keys when he stumbled upon Booth's Derringer pistol on the floor. Virginia Brown described the original letter, written by Kent to his mother the day Lincoln died, as a 'cherished part of my childhood.' However, it disappeared after the death of Brown's grandfather and subsequent sale of the family house and possessions in Jackson, Mississippi. Brown said she had given a typescript copy to Lincoln enthusiasts at Kennesaw Mountain National Park, Georgia, exactly half a century before contacting me - a statement verified by park officials who sent me a copy of her letter to them dated 1953. I have quoted from the typescript copy because I do not have any doubts about its authenticity, based upon her lineage and Kent's language, vivid descriptions, and the dateline, Washington, April 15, 1865."

Perhaps this letter mentions the opera glasses?