Ron, the exp date on the 665 was May '07 but I recall buying them long before that (I think it was middle of '06) and put them in the fridge immediately. As I recall it was around the time that 665 was being discontinued and I bought a bunch a few months later when prices seemed to be spiking. I suspected that it'd die in the fridge but it didn't... wish I'd bought more!
Regarding the pods: dumb/nutty question. If one really wanted to store polaroid long term, might one snip off the pods and keep them in the fridge, and freeze the actual film and positive sheet separately? I realize that the processing would be a pain in the arse, but.... desperate times...
Related question, why doesn't somebody decouple the chicken from the egg and sell us polaroid goop separately. I'd guess the actual film and pos sheets could be made and stored quite inexpensively and compactly. This might be my cabin fever and flu/allergy meds speaking though.
You see from David's post, that it can be done. The object is to have a continuous sheet from the pod down to the end so there is no break for the fluid to leak out of.
As for the formula for the color material, I can give a guess.
KOH 1 mole / liter
Carboxy methyl cellulose 20 - 50 g/l (like Citrucel, the laxative)
Restrainer about 100 mg - 1 g/l
Developing agent about 500 mg/l - 1 g/l of Dimezone or the like.
The B&W material is similar but has a load of silver halide solvent and some other things.
There are patents that show this though, so you can fill in the blanks by looking them up. Search for Pod and Polaroid.
I used to know it, but have forgotten the details. And yes, it can be added from a syringe and the processing can be done outside of the camera as long as some sort of 'rails' are used to allow the goo to spread evenly. The rails would be something like a mask of about 5 mils (0.005") around the print area into which goo can spread. You can see the 'rails' if you take the print assembly apart.
As for the expiration date, I guess you are within the cutoff that I mentioned earlier. This would run about 6 months or less from the expiration date in most cases.
PE