In all the years of buying silver, I never bought 1 single silver coin, only bars.
I knew some people that preferred pre decimal OZ coins, that wouldnt show up on that data either. American eagle sales lists are not the be all and end all for accurate silver data. Very US centric.
i know that when I was buying bullion the dealers office was like a ghost town. Now it is the busiest I have ever seen, and amateurs everywhere.