I have been following that auction.
Too bad so many (almost all) are slabbed, it makes them difficult to test scientifically. Also the grading is done as if they were struck on more modern presses. Sheldon's scale was developed specifically for copper cents and is very poor when applied to a silver coin of dollar size.
Fully struck 8 reales are not common in the Cap and Ray series of the First Republic. These coins need to be graded by an expert in the type because the dies used contribute greatly to the poor strikes. MS is meaningless since some MS coins are ugly and weak struck and actually NOT WORTH the selling price to a specialist. But I see people being suckered into high bids when a coin is referred to a "highest graded" or some similar drivel - even when the coin is extremely common. Most of the best C&R 8Rs reside in collections of specialists who know grading is a scam and would never consider placing their coins in tiny plastic coffins.
There are some interesting varieties that are truly rare hiding in the auction, but alas no counterfeits. Not much for a fellow like myself in this group.