Please note "Food Packet, Survival General Purpose" is not the same as MRE's. They are deigned for differant purposes.
The survival food packet contains some pretty stable items. I have used the older style survival food packets stored in a metal can that were twenty years old. They tasted as good, or as bad, as when fresh. Not much can go wrong as long as they were kept sealed.

"There is nothing so frightening as ignorance in action."