Last known picture of Abraham Lincoln

[loetar44]

Maybe an old discussion, but today I exchanged thoughts with a friend of mine about the last known picture of Abraham Lincoln alive. Several books published by well-respected Lincoln authors say that Alexander Gardner’s photo (the one with the crack in the glass plate)of April 10, 1865 is the last picture of AL alive. But “new evidence” indicated that the date of April 10 was not correct and was more likely (???) February 5, 1865, making a photo of Henry F. Warren which he took February 6, 1865 on the south balcony of the White House, the last known one of Lincoln alive. What exactly caused that April 10 for the Gardner portrait suddenly became February 5?