The date seems odd. On May 27th, the armies were nowhere near Cold Harbor.
I wonder if you'd be willing to email Alfred Young, who has done a study of Lee's casualties from May 5- June 12th including a nominal list?
I can't contact Young because we've had a falling out.
I think Al can clear this up.
Alfred Young
15105 Athy Rd.
Burtonsville, MD 20866
(H) 301-421-1808
yslac@netzero.net
Bryce