If the boxed pure milk you bought has expired, don't eat it. Once the shelf life has passed, it may deteriorate, produce odor or be moldy. Even within the warranty period, if the product is found to have peculiar smell, abnormal color and abnormal texture, it should be stopped immediately and handed over to relevant departments for testing. After all, food safety is an important issue that everyone should pay close attention to.
In a word, boxed pure milk is a nutritious, convenient and quick drink, but attention should be paid to the shelf life and storage conditions when buying and storing to ensure its quality and safety.