It was collected in the very interesting Letters to Sherlock Holmes, edited by the late Richard Lancelyn Green and published in 1985. This is what it said:
The Letter from Edward Lear
To Whom It May Concern:
I understand that there is someone who answers requests to Mr. Sherlock Holmes. Is there any chance that I may obtain some Sherlock Holmes memorabilia?
In any case I would appreciate an answer.
Ed autographed my copy of the book on January 6, 1990. I had the pleasure of autographing Ed's copy of my book Baker Street Beat on August 7, 2011.
Have you ever written a letter a letter to Sherlock Holmes?