Sean,

I did in fact print some older Agfa papers a few years ago, and they did produce a slightly fogged print. With the right chemistry I'm sure you can make use of them.
The paper had, just like your paper, been stored in a 'cool' place. The prints looked cool the way they did, in my opinion, even though they were probably not tonally correct.

Good luck and have some fun with it!

- Thomas
Saint Paul, Minnesota