I brought them home from the grocery store once. In baking chocolate, of all things. We have one grocery store here that I won't buy anything from other than canned goods because when you walk down most other aisles the darn things are flying around. I complained and the store mgr replied, "Well, this is Florida.". But our other supermarkets don't seem to have this problem.
Long ago I learned to keep bay leaves scattered and to freeze everything for at least 3 days.
I hope you get rid of the problem fast.