What of Spencer Bronson's April 16, 1865, letter stating, "Miss Keene . . . went around into the box holding the President head while an examination was being made"? He may have been giving a secondhand account, but it's an early secondhand account. (I have no idea what Bronson's profession was, if that's important to his veracity, which I don't think it is unless it was that of a con man.)