Ewwwww 😷😷😷😷😷 that's why I always check the box before opening it for rodent bites if I'm safe I open it and store it in the fridges. I leave my boxes of cereal in the fridge or on top of it. Ugh hope you find your solution to the problem

you should probably check your house to see if you find droppings anywhere else...if not call the number on the cereal box and complain..