I recently encountered some sellers trying to pass off what probably was counterfeit food at my supermarket. The counterfeiting was easy to detect. Some products had labels that were faded and not as bright as they usually appear. Other items had crooked labels and strange blotches around the letters that appear to have occurred during, not after printing. Others, I only identified after eating and found the taste quite inconsistent with what I usually get.
Suppose I find food items that do not have such obvious printing mistakes. Are there additional ways I can determine if a product is genuine? Can any of the labels, such as the numbers printed on the bottom of canned soup, tell me if the product is authentic?