They can sneak in through an unsealed part of the fridge. Normally what happens, and why most food goes bad, is because there are already organisms present in the food when you get it. They’re just dormant, or of too small numbers to do anything. Given enough time, they multiply or grow, and your milk goes bad or bread gets moldy. Maggots are fly larvae, and their eggs are normally pretty sizeable (likely visible), so what probably happened in this case is a fly either laid eggs on the food before it was put in the fridge, or it got in another way.
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