How long can box soup last after it best used date?

The shelf life of boxed soup can vary depending on the type of soup and storage conditions. Generally, if the soup has been stored properly in a cool, dry place, it can be safe to consume for 1-2 years past the "best by" date. However, it is important to check for any signs of spoilage such as unusual odor, appearance, or taste before consuming. If in doubt, it is best to discard the soup to avoid the risk of foodborne illness.