Ken,
Just found this reference to a captured flag of the PCA.
1906-02-14; Paper: New Orleans Item

At a veteran meeting there is a statement by one of the committee members "giving into the custody of the camp... the flag of the Pointe Coupee Artillery ... captured during the war and lately returned by act of Congress." Other flags of other units were mentioned too.
You think this was the Battle flag captured at Nashville, #220 at the Confederate Memorial Hall in N.O. ?

For previous discussions of PCA war period flags see this link

http://history-sites.com/cgi-bin/bbs53x/mscwmb/webbbs_config.pl?read=20974#Responses