When I first lived in Middle Easter countries, it was impossible to buy flour without weevils - usually just the tiny larvae - in.
Weetabix was known locally as Weevilbrix!
The only solution with flour was to put it in the freezer, to kill them, and then use a fine sieve. I gather they are not at all harmful, though.
One Christmas, same place, I wanted to make mincemeat - you couldn't buy it anywhere. The first lot of dried fruit had so many weevils (beetles and probably larvae) in it, I took it back to the shop.
Shopkeeper gave me replacements, assuring me that there were no 'animals' in this lot.
It all looked fine so I went ahead with my mincemeat - only just as I was tipping the last lot in, I spied some tiny black thing moving...
Sod it! Having got thus far I just carried on, couldn't waste all that sugar and hard-to-come-by dried fruit!
Nobody but me was any the wiser.