Jim, I looked at a lot of the pages, and thanks for posting the high-res images.
A couple of thoughts if that's OK-
A couple of stamps that are labeled as Type IIIa, the top of the stamps are not visible because of centering, and without seeing a break in the curve at the top, unless the stamps have been plated, not sure you can label them as Type IIIa, and they're probably Type II.
On page 19, the middle image, it shows 91R9 and Type Va. That can't possibly be as Type Va by definition must come only from Plate 5, and not even all of Plate 5 is Type Va.
Whoever ID'd these for several of the stamps that are marked as Va, I think is looking only for a lack of side scratches, and that's a common mistake in identifying Type Va. The plates for Type V stamps (Plates 5, 7, 8, 9 and 10) used 6 different dies or reliefs. Starting with the top row, the die was rocked into the plate and created reliefs A (top row), B (2nd row), C (3rd AND 7th row), D (4th and 8th row), E (5th and 9th row), and F (6th and 10th row). With reliefs A, E and F, there are never any side scratches. If the stamp is relief B, C or D, and there aren't side scratches, then the stamp is type Va. If it's relief A, E or F, then the stamp really has to be plated to determine if it's Va. So, to ID a stamp as Type Va, one must first identify the relief.
The first stamp on page 21, I think, may be 91R8. Again, the top is cut away, so I'm not 100% sure that it's a F relief, but I think I see the faint scratches on the lower right from the image on Doporto's site. The mottling on the bottom of the stamp looks a lot like Plate 5 B relief Type Va stamps, but I don't think it is. I tried to ID one for you that wasn't marked as Va!
Good luck with your sale. You might want to add the Va's to the Plate 5 topic, and someone will be able to give an opinion, or even plate the stamps for you. With the angles, and the short tops of some of the stamps, I struggled.
Thanks, and hope this was helpful, Ray