Shawn,
While I do not pay much attention to "captured artillery", I do take a more than
casual interest in Confederate flags.
Richard Rollins' book "Damned Red Flags of the Rebellion" remains the best source
for captured Confederate flags at Gettysburg.
Published in 1997; has new research uncovered "new information"? You bet, it has!!
Alas, Mr. Rollins has passed from this life; so any revision will have to come from the
pen of another.
Your criticism of Rollins' work is unfounded.
If you can do better; then do so!!

Ken Legendre