I bought a similar seed setup close to 20 years ago. Kept them around for around 15 years, all still sealed in the little metalized bags they came in. Ended up giving most of them to my brother because he had plenty of land to plant in. Germination rates were still plenty good enough to allow him to grow a very large garden. Different seeds were different but almost all of them were better than 50% germination after 15 years of storage.