The National Cemetery list for Camp Butler places this soldier in plot#543.

There are many sources for Camp Butler. Here are a few --

http://www.illinoistimes.com/Springfield/article-5015-camp-misery.html
http://www.campbutler.com/

Illinois Camps, Posts, and Prisons by Victor Hicken, Illinois Civil War Sketches, No. 9, published by Illinois State Historical Library for the Civil War Centennial Commission of Illinois.
Camp Butler National Cemetery, by Fonda Baselt, Illinois State Genealogical Society Quarterly, XXIII:3 (Fall 1991), pp. 161-163.

http://www.sj-r.com/features/x27446161/Dying-far-from-home-Camp-Butler-also-home-to-Confederate-soldiers