:') There's only one known photo of Lincoln in the coffin, taken at one of the funeral train stops, where his body was out for public viewing, a pause on the way back to Illinois.
I recall seeing a photo of the coffin about to be covered with concrete though. ;')
LOL! I whine about not finding the photos of Lincoln's corpse on Google and elsewhere...Murphy's law jumped right in.
Life had those photos in Feb or Mar '63.
The only known photo (for those who must see it):
http://www.celebritymorgue.com/abraham-lincoln/abraham-lincoln.jpg