How did you find out the codes for the mill locations?If we buy the Flock Raiser from TSC, it comes from a mill in St. Joe. If we buy it from a different feed store called Race Bros, it comes from a mill in Springfield. The 2 always look different. The St. Joe mill’s feed is darker with bigger pieces, less dust. My chickens like them both, but I prefer to buy from Race when I can because it’s only $21, compared to $27. BTW, as of last year, Purina dates their bags using the Julian calendar, which numbers the days from 001 to 365.
I have seen different colors and consistency from the same mill,
I attributed it to variance that can be quite normal in manufacturing equipment(which I have some experience with)