How do little black bugs or worms get into sealed packages of food such cake or pancake mix?

Little black bugs or worms, often pantry pests like weevils or flour mites, can infest sealed packages of food through tiny openings or during the packaging process. They may also be present in the raw ingredients before processing. Additionally, if the packages are stored in areas where these pests are already present, they can find their way in. Even sealed containers can sometimes be compromised by wear or damage, allowing pests to enter.