The order in which they manually credit the points doesn't always seem to make sense. Some relatively early purchases haven't been credited yet, and yet some of the very last packages bought have been credited already. Alphabetical or alphanumeric order doesn't seem to fully explain the crediting sequence either.

I am left to conclude that they put together or are given one or more lists of purchases/purchasers and then Choice slices up the list/lists and divides it amongst staff for purposes of manual entry and loading (perhaps loading in batches).