Two holes that are still empty in my folder as well, been wondering the same thing for a few years now. The 52 ARN is listed in the back of the 2012 Charlton, it is labeled as Rev.-003. I am not sure how rare these are but I think part of the problem with finding one is that when they are listed ungraded on ebay they are usually just given one of the three more standard varieties (FWL,SWL,NWL), and it's always almost impossible to tell from the pictures. If they are graded by ICCS, they will not give the attribution "ARN" on the flip, they will however put the reference to the Charlton # for an extra charge, which many people will not do for a 52'. For example I recently saw an ICCS graded 1952 silver dollar on ebay in AU-50, and on the flip it read "WL; Cleaned, CH#1952 Obv-002 Rev-002" but actually if you look up Rev-002 in the Charlton catalogue it corresponds to a SWL variety. My guess is that if the extra fee isn't paid to identify the Charlton variety number then the coin will be labeled as just "WL", which simply means that water lines are present, but could possibly be an ARN. I have a 52' that I got graded by ICCS thinking it was an ARN (at the time I didn't know they wouldn't attribute one) and it came back as WL, however looking at the other graded WL 52's on ebay there is a clear difference in the water lines between mine and the others (am still not exactly sure which variety I have, doesn't seem to match with any of the Charlton numbers). Anyways, my goal for this year is to find a true 52' ARN and at least fill that hole, I will definitely put together some pictures of the different varieties I have if I am able to find one.
On the other hand, the 67 small beads reverse is still a mystery to me. I posted about it a while back and got the same response that it was in the 2012 Charlton and listed as "Extremely rare" and I looked it up and thought I found my answer, however later on I realized that I was actually looking at the variety labeled as Obv.-002 "Small Beads" which would obviously mean 1967 small beads OBVERSE. I could be mistaken but I am fairly certain that all 1967's have a small beads reverse (in comparison to the obverse anyways) and there is no reverse varieties listed for any reference to the bead sizes (only standard coin, diving goose, and coinage axis). So I believe you could technically put any 1967 in that hole and still have it correct, but then the question is what to put in the "large beads reverse" hole.
Just as a side note if you are looking to fill the final 4 empty unlabeled holes, I put in the 1957 1WL and 1964 no dot varieties in the first two blanks and then the obverse from a 53-64' and one obverse from a 65-67 in the last two blanks. For the 1935-1952 folder I put an obverse of a 35-36, 37-48, and 49-52 in the last 3 blanks and I still am not sure what varieties to put in the other two blanks.
On the other hand, the 67 small beads reverse is still a mystery to me. I posted about it a while back and got the same response that it was in the 2012 Charlton and listed as "Extremely rare" and I looked it up and thought I found my answer, however later on I realized that I was actually looking at the variety labeled as Obv.-002 "Small Beads" which would obviously mean 1967 small beads OBVERSE. I could be mistaken but I am fairly certain that all 1967's have a small beads reverse (in comparison to the obverse anyways) and there is no reverse varieties listed for any reference to the bead sizes (only standard coin, diving goose, and coinage axis). So I believe you could technically put any 1967 in that hole and still have it correct, but then the question is what to put in the "large beads reverse" hole.
Just as a side note if you are looking to fill the final 4 empty unlabeled holes, I put in the 1957 1WL and 1964 no dot varieties in the first two blanks and then the obverse from a 53-64' and one obverse from a 65-67 in the last two blanks. For the 1935-1952 folder I put an obverse of a 35-36, 37-48, and 49-52 in the last 3 blanks and I still am not sure what varieties to put in the other two blanks.


















