You first :) If it hasn't changed up to 5% of a hundred lb bag of flour could be anything from plant debris to grasshoppers rat poop.That would be 4.5 oz on a five pound bag of flour, I think.
Those small four and corn mills are just about all tourist sites now.
When we find one if not too expensive we buy there. Flour and every thing else is best when fresh. Some on shelves have expired dates and if still dated as expired,maybe be months old. Eat corn bread, bread or biscuits made with fresh grains and see what the receipts in the old Cookbooks taste like.