What about dessert items in the newer polymer trays?
The polymer trays, although not as robust as the metal, will last quite well compared to the "store packaged" style desserts.
The "store packaged" style are more o2 permeable, as well as allowing light right through the pack because they are clear.
I cant guarantee this, but i doubt they are sealed in a o2 free environment, or lacking that, nitrogen purged.
In other words:
Metal t-18 = canned
Polymer t-18 = retort pouch
"store packaged" t-18 = commercial food not meant for storage other than being frozen
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