The mountainhouse canned food has the long shelf life. The bag stuff is not rated to go much longer than MREs. The only difference I know of is the packaging. The cans are more secure.

The cheese/broccoli/potato soup is a pretty standard item among any of the freeze dry food companies. I have had the stuff at ten years and it seemed "old" but definitely not bad. I personally never leave it as-is, but will add some butter, sour cream and olive oil when I make it. Often some fatty ham too.

Given the stuff is way the hell past date, I would hope you got it super-cheap. My suggestion would be to start eating the stuff bigtime, and then buy brand new Mountainhouse or Augason Farms stuff to replace it.

I was just doing inventory on my long term storage food this afternoon and figured out the investment is well over $1K for a true six month supply (at a realistic working man diet, not 1500 calorie per day starvation). Don't be at all surprised if you get closer to $1500-$1800 when you consider lunches away from the kitchen, meaning MREs and other ready to go stuff which costs more per serving. The thing is, I think it could a definitely be stretched. 400 cans sounds like one of those one year family supply deals.

You would likely find yourself still adding a lot of fresh foods to the diet, but I would consider advising you to make a video project of eating through the survival food for a month at a time then maybe a couple months at a time, show people how it is done. Very few people, even among those who buy the stuff have actually tried to live on it for a while.

While you are living on the stuff, use half your ordinary food budget to supplement it (you will likely still want to hit restaurants and convenience stores every once in a while) while you use the rest of your normal food budget to buy brand new replacement long term storage food.

I have been doing exactly that in recent months as I eat through my "older" stored food and am phasing my food storage program in to using primarily the long term storage stuff, but there is still a pretty big portion of it that can't work on the same shelf life program.

Meats- no way you can get them to last more than a couple years. Expect to obtain/hunt/farm meat if you really want it during SHTF. The driest home made beef jerky I have made only goes about a year when not refrigerated. I think I could get several years out of it if I freeze it though.

Oils - Nearly all of the long term storage stuff has to be low oil foods in order to prevent it from going rancid, which also means the food is low in oils and while it is not mandatory to ad oil when you cook the food, it makes a huge difference in nutrition and palatability. It also adds much needed calories to those low calorie diet "portions". The oils you are likely to want to use have a varied shelf life, and some can go a very long time, just not as long as the freeze dried food, so expect to need to keep a lot on hand to work with the food supply. Think everything from lard to olive oils. The types you want to store the most would probably reflect your cooking style. I think individuals would have a lot of waste trying to deal with five gallon buckets, but that makes sense for larger groups.

Spices - A major help for raw unprocessed food, but not all that necessary for the survival foods except certain dishes. Spices also don't always have the same shelf life mainly due to the packaging styles.

Vinegar - a major old school old world preservative and flavor agent. You can make it in SHTF, but it is cheap and easy to store. Another major enhancement for storage food which usually means various soups and stews. Vinegar usually has indefinite shelf life though depends again, a lot on the packaging.

Sugars - also often separated out of storage food for a few reasons, sometimes left in. The issue is that sugars can attract moisture right back out of any possible air and turn the stuff to goo, which in turn will start to make stuff go bad. You can store it separatetly, but indefinitely if it has been packaged right.

Salt - it is a mineral anyway, so you can store it indefinitely, just watch the packaging since it too can absorb moisture and then become more difficult to use.

Don't forget the toilet paper...

soap, laundry detergent, dish detergent, tampons, maxi-pads, shampoo, toothpaste, tooth brushes. Fortunately that stuff all can last indefinitely. You buy it once, put it in the storage and that's it.