George, the NARA will not allow anyone looking at the Confederate CMSR's if they are on fold 3. There are exceptions such as not being able to read the cards on fold 3. I'm only guessing but years ago prior to footnote we were allowed to look at the actual Confederate cards and sometimes folks were looking at several jackets at one time. (Not done so now while looking at the Union cards you are only allowed to look at one jacket at a time) Sometimes researchers years ago would run out of time and the cards were put into the wrong jacket. This might explain this? Later on the folks at the Archives might have discovered the error and put the cards in the correct jacket thus having duplicate cards. In my opinion I don't think Ainsworth and his staff made the error while making the records.