Seemingly so

Special Order 191 (series 1862), also known as the “Lost Dispatch” and the “Lost Order”, was a general movement order issued by Confederate Army General Robert E. Lee on about September 9, 1862, during the Maryland Campaign of the American Civil War. A lost copy of this order was recovered on September 13 by Union Army troops in Frederick County, Maryland, and read by General George B. McClellan, who changed the direction of his movement to conform to Lee’s movements the document described.

About noon on September 13, Corporal Barton W. Mitchell of the 27th Indiana Volunteers, part of the Union XII Corps, discovered cigars wrapped in a piece of paper lying in the grass at a campground.

https://en.wikipedia.org/wiki/Special_Order_191