Not sure if this is an urban myth, but apparently some children kept a cheeseburger in their class for 6 months as an experiment. 6 months later it still looked as good as new! Even if that is a falsey, I am sure there is some truth to the amount of sugars, salts and fats that act act preservatives, not to mention the chemical preservatives as well. I have never heard of anyone getting listeria, or even food poisoning for that matter, from a Maccas Cheeseburger. They are cooked fresh right then. I ate them all throughout my last pg and this one, and am fine. I just did what you did, made sure they make it fresh Don't stress hun, you will be fine.