Since I posted that yesterday I’ve been weighing the pros and cons of putting it in a closed container of some sort. I want to keep it exposed to air because that seems to be what was claimed originally, but I also don’t want my house to smell like McDonald’s for a year (fresh or rotting) and I don’t want flies. Flies are one reason I have trouble believing this claim. Wouldn’t bugs have been able to eat a Happy Meal over the course of a year? Even if it didn’t rot, it should still have been consumed by pests.
You could put some sort of screen or mesh around the food which would keep out flies ( laying eggs>>> begetting maggots) and other large insects. You may want to put it up high enough to keep it away from the dog/cat, but the bugs you won’t be able to keep out are the bacteria and mold which will surely set up shop and rot the food since there is no way to properly sterilize it without destroying it.
As unhealthy as happy meals are to eat, they are yummy to all sorts of other organisms so any myth that it would survive for a year does not need much testing. Leave it in a sealed container at room temperature for a couple weeks and it will still be rotten.