2009 might be a bit old unless they were stored in the freezer.
When we moved here I planted a bunch of from the similar type can you’re talking about from 2009 also. Must have been a good sale that year or something! Anywhere they sprouted fine, that was in 2015 so they can was 6 years old. I didn’t start storing my seeds in the freezer until after that, so they were just at ambient temperature.
I never bought any seeds after that because I harvested the non-hybrid seeds and have been using them the following year. I really enjoy harvesting the seeds, it’s almost better than the produce.
I checked them by dampening a paper towel, sticking a bunch of seeds inside it, then sticking the paper towel in a ziplock bag. Put it in a warm place and see how many sprout. If not all do then I just plant double or triple the number of seeds.
Thanks for that great tip!!