@bruceha2000, it's not a lot of yeast when you make your own bread and hamburger buns. My bread recipe for Amish Sweet Bread takes 1.5 tablespoons of yeast and the hamburger bun recipe takes 2 tablespoons. If I make sourdough or machine bread it takes less but I make sourdough as a treat and machine bread if I'm not feeling well or it's too hot for the oven to be on.
Trust me, using that much yeast per recipe makes the container go down real fast.
As for freezing the flour. I've found worms in boxes of Jiffy mix if I keep them around too long or don't freeze them. Not so much in store bought flour although it has happened. If I bring any flour or flour products in from bulk stores I definitely freeze it as I've found worms in them if I don't. Those little buggers spread like...well like the coronavirus is in the big cities.
If you aren't fining them in your flour products you should consider yourself lucky. Maybe it's a regional thing?