Of at 11-13 reported CS flags captured..found references to:
Flag Captured by
4th N.C, Infantry {61st N.Y. Infantry}
6th N.C. Infantry
8th Florida Inf {2nd Ohio Cavalry}
18th Florida Inf {1st WV Union Cavalry}

There is a drawing from a tintype which shows at least 20 captured CS flags at sailors creek!
https://civilwartalk.com/threads/sgt-george-f-robinson-william-sewards-attendant.123703/

https://books.google.com/books?id=dM9GAQAAIAAJ&pg=PA474&dq=flags+captured+by+Tom+custer&hl=en&sa=X&ved=0ahUKEwjr097ahvrVAhVB4yYKHYYRA304ChDoAQhXMAk#v=onepage&q=flags%20captured%20by%20Tom%20custer&f=false