Thanks for this information. I too had this flag as being at the Atlanta Cyclorama in Grant Park but I have been there many times over the last few years and have never seen the flag.
The former director of this facility had a huge Civil War collection including weapons, etc. and he placed it all on display in this museum. It was a wonderful display. I do not recall ever seeing a flag back then (this is 15 or more years ago) and he sadly commited suicide and his collection was removed to who knows where not long afterwards.
Greg Biggs