Hi Anthony,
The flag taken by the 33rd Missouri (US) was taken to St. Louis and presented to the Mercantile Exchange (I think that's the name - will have to pull the file) which sponsored the raising of the 33rd Missouri Infantry. I presume it is still somewhere in St. Louis today.
I am not sure In have a full ID for whom this flag was taken so let me pull my file on Helena and see what I have.
Greg Biggs