If you get maggots in the food they were already there. More exactly the eggs that they came from were already there. Maggots are the larva of flies, another insect also lay eggs that become larva that might look similar but they are long maggots.
The eggs might be there when you purchased the food but they can also get to the food in your house. A fly can lay hundreds of eggs at once. It can also be that there is insects in the fridge that lay the eggs after you close it for the last time.
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