… throw out the cereal or return it to the store for a refund — even if some of it was already eaten and no one got sick.
Also, if you keep cereal that looks like Kellogg’s Honey Smacks in a container without the packaging and do not remember the brand or type, just throw it away. Wash the container thoroughly before using it again to remove any harmful germs that could contaminate other foods.
Better to be safe than sorry.