I've not heard of discoveries like these. Even if a group of authentic rolls was discovered, records assembled and catalogued by the War Department are unlikely to be updated. For example, the record you found in Unfiled Papers and Slips is not likely to reappear in its proper place with the 5th Georgia Regiment. It seems like a simple revision, but evidently it's not. A new Confederate records project would have to be funded by Congress, and I don't foresee that happening in our lifetimes.

You probably have already checked the Georgia State Archives. Different state archives have unit records that were not included in the War Department collection. Examples are the company records assembled by the State of Alabama during the war, only some of which were used by the U S War Department. Other examples are final rolls kept by company officers. Records kept by companies through April 30, 1865, could not be forwarded to the War Department because Richmond had been evacuated. In some cases officers simply took them home after being paroled. These were later turned over to state archives by descendants.