Thats exactly what I had found. The 102nd new york had captured the 12th Ga's flag at Chancellorsville. I am very happy you have found solid evidence on this matter.
I believe it was very rare for a Confederate regiment to go through 4 years of war and not lose a flag.
The 14th nc claims just to have lost 1 flag (Sharpsburg).
The 25th nc says they never lost a flag.
It is difficult, at the battle of Sailor's Creek and the smaller engagements that led to Appomattox surrender. So many flags were captured, even to this day they are unknown.
But what I have attempted to do was take the flags that were surrendered at Appomattox and what flags were not turned over and see what there was.
Thank you, very much for the help!