Foreign matter in flour
A while ago now I've started using Giusto's flour bought in bulk from my local Whole Foods. Since then (I only realized recently the coincidence of these things), I've been finding small items in my doughs that don't belong. Luckily for me, I've always discovered them during a little final hand kneading and have been able to remove them. They are grey, and look like little half spheres. They are about 2-3mm in size and feel slightly rubbery, although they seem to have little elasticity and are somewhat hard.
Just last night I actually noticed on in my bowl after scooping in the flour, which gave me proof positive these come from the flour. In last night's batch using about 750g flour I found no less than 4 of these things! I suspect they are left overs from Giusto's milling process. The items are all identical which seems to indicate some man made origin.
Have any of you experienced this with Giusto's, or any other flour for that matter? Is it normal to find stuff like that and does it imply I need to sift my flour first? I've never had any issues like this with KA or typical super market label flour.