1) That the history of the cigar box, and thus the history of the cigar box guitar, places the cigar box no earlier than the 1840's, about 20 years prior to the Civil War, and
2) That the earliest known engraving or picture of a cigar box instrument shows two Union soldiers sitting in camp, one of them playing a homemade fiddle made from a Figaro cigar box,
I found this announcement from late July this summer particularly interesting:
This album features well-known country and Americana musicians and producers, interpreting famous songs of the Civil War. One hopes that at least one CBG was used.
Look for it this fall!