So didn't see them, at first, but felt them as I lifted the lid of feed can this morning.
Got flashlight out and sure enough, all over the lid inside and out, on inside and outside of can. Moving but sluggishly in the 60°F temps.
Can't see them on the white fed bag interiors,
could have come with the FR or the scratch from feed mill.
Didn't see any on the feeders, but didn't look too close.
Wiped some DE all over, changed out lid and squirted off the buggy one.
Now I'll be looking, for moving dust, once again.