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There is a very old cheeseburger and fries in a guesthouse in Iceland. If anyone wants to see it, here is a link to the live feed.
Sealed dry container stops food going mouldy shocker.
You say that yet sandwiches in a sealed tupperwear go mouldy and decompose ......
Tupperware stops them drying out quick enough.
https://www.snopes.com/fact-check/six-year-old-happy-meal-doesnt-rot/
https://www.businessinsider.com/experiment-shows-mcdonalds-burgers-rot-2015-6?r=US&IR=T
The suggestion is that there are so few nutrients in the food that the bacteria can't grow. But this is clearly total rubbish, as bacteria can grow on anything and everything including plastic and rocks. McDonald's would have to run a massive and expensive purification operation stripping out all the nutrients from their food. Why in earth would they? They'd just end up with pure protein which bacteria would still eat.
As above, it's because it's dried out before the bacteria could grow. The art teacher in my school had a selection of home made cakes used for drawing still life, they looked delicious but were about 20 years old, just dried. We did the same with a surplus baguette from a French school trip. Dried it out to see how hard it would get (rock hard) then kept it for years looking and even smelling delicious.
So complete science fail, I'm afraid. McDonalds burgers are made from cheap cuts of regular beef as most burgers are (this is the point of a burger after all) and the bun from the same flour everyone else uses, I'm sure, cos that'll be what's cheap.