Someone emailed the question "Did Daniel Sickles visit his leg in the Museum?" in today.
Here's a bit I ran across a few years ago. A very old doctor wrote his reminiscences of people who knew in the US Army Medical Department in "Personal Recollections of Some Old Medical Officers" by Henry Crecy Yarrow,
Military Surgeon January 1927, pp 73-74:
One day he [Curator George Otis] received a visit from a fine looking gentleman of military bearing, who announced himself as General Dan E. Sickles, and stated that he understood his leg, which had been amputated in consequence of a shell wound received in the battle of Chancellorsville, was on exhibit in the Museum. Dr. Otis replied that it was and with that courteous urbanity of manner for which he was celebrated, invited the General to accompany him to the main hall of the Museum. He pointed out several interesting specimens, but the General, apparently losing patience, said, Oh, yes, yes, but let us come to my leg!" They finally reached the case where the leg was exhibited and the General examined it very carefully for a few moments, when he turned to Otis and said with some harshness, "Where is my foot?" What have you done with my foot -- that should have been shown too." Otis replied that there seemed to be no necessity for saving the foot as the part saved showed why a surgical operation was necessary. The General became very angry and anathematized the museum very freely."