Not a direct answer, just my 2 sats about this topic.

In my experience, when asking such questions myself, I found out, that there are varying definitions of "expired" or "gone bad".

For example, if something changes its color or taste it is not necessarily spoiled. It may just have changed. Of course, it always depends on the situation & the type of food.

With this question it's even more complicated. What is "proper"?

Sealed 100% airtight or only mostly airtight?

Is it in a vacuum or not?

What kind of material is it stored in?

How would you prepare the food after getting it out if the pentry & preparing it to eat?

For example, some food can be eaten safer, if it's cooked right before being eaten, even if it was cooked before.

These are my reasons for why you most likely get different answer to this. :)