My reasoning here is that anything that involves water and starch and has to live in a refrigerator is actively decaying no matter how many preservatives are packed in it. If it's wet and has carbs or fat in it, it WILL go bad.
I am pretty much infinitely tolerant of anything completely dry and sealed, that does not need refrigeration. Also I basically go by the "if it's not slimy or black it's fine" for vegetables.
@neonsnake @rechelon I once sampled some Ferrero Rocher hazelnut/chocolate thingies that had been in a suitcase in a non-climate-controlled basement for a decade and the wafer shell was mushy but the overall experience was pretty inoffensive