Odd box - had to hand sort

Have been machine sorting now for quite a few months, but had to change approach for this box. I picked up a box at a different branch while I was out at lunch the other day. They were short on coin but grudgingly let me have one box, this a Dunbar supplied box. As I started on it my first observation was an abnormal amount of wheaties. So many so that I finally had to stop and re-start over by hand. I didn't keep exact stats, but in round numbers I pulled about 4% wheats, which is about 4x my norm, and included a 1909 and a 1910, as well as a fair number of other teens, and a few S mints, which are hard to come by here.
As I got into the hand sorting, I started noticing an extraordinary number of 82s. It seemed like about 20% were 82s! As I went on I realized that it wasn't just 82s, but that almost all of the memorial cents, probably 90% of them, were in the 79 to 82 range. (There were a smattering of other years, but an unusual number of these 4 years.)
And lastly, it seemed that the total copper content was very low for my area. I'm usually in the 21-23% range, rarely vary much (except for the recent Brinks issue, or dumps of Grandpa's CWR stash). This box was about 15%.
I've seen some odd CWR sets. But out of hundreds of armor car boxes, this is the first I've seen like this.
Is this just a statistical fluke? Or is there something more of a pattern here. Does Dunbar use some type of supersorter? Is it possible that their supersorter misses certain years? Like wheats and 79-82, such that they have begun to be condensed in Dunbar coin? Seems unlikely, but just a wild thought.
As I got into the hand sorting, I started noticing an extraordinary number of 82s. It seemed like about 20% were 82s! As I went on I realized that it wasn't just 82s, but that almost all of the memorial cents, probably 90% of them, were in the 79 to 82 range. (There were a smattering of other years, but an unusual number of these 4 years.)
And lastly, it seemed that the total copper content was very low for my area. I'm usually in the 21-23% range, rarely vary much (except for the recent Brinks issue, or dumps of Grandpa's CWR stash). This box was about 15%.
I've seen some odd CWR sets. But out of hundreds of armor car boxes, this is the first I've seen like this.
Is this just a statistical fluke? Or is there something more of a pattern here. Does Dunbar use some type of supersorter? Is it possible that their supersorter misses certain years? Like wheats and 79-82, such that they have begun to be condensed in Dunbar coin? Seems unlikely, but just a wild thought.