Yep. Found abbout 70 of the 1964 cents in BU condition over a few boxes a few months ago. I think it means someone released a box or two of that cent and it went into the hopper. got mixed around a little, making it come in a few boxes, but not too much, so most of them came about the same time. Either the mint had some in storage, a bank had some somewhere, or some entity or person dumped them for some reason.
It happens.
I have some I have put aside too, many different years, I have wondered if they worth keeping separate or just add them to the copper pile. I just got a 72s that looks uncirculated put aside too, it's the nicest of the bunch HH, Maverick.