I believe the photo came from Sarah Bush Johnston Lincoln's granddaughter, Mrs. Harriet Chapman. I believe she gave a copy of the photo to William Herndon. The last I know is that the original was in Harriet Chapman's possession; I have no idea where it is today. Possibly lost to history? A good guess as to when the photo was taken is c.1865. Harriet Chapman sent a copy to Herndon in 1866.
Recently a second photo of Sarah Bush Johnston Lincoln has apparently been discovered. Ed Steers included it on p. 62 of
Lincoln Slept Here - Abraham Lincoln's Kentucky and Indiana Years 1809-1830. This photo is an original, not a copy.
http://jg-tc.com/news/only-known-origina...39251.html