I watched a YouTube video from "Home Grown Veg" yesterday on testing old seed for viability. It prompted me to copy him and do a test on all the outdated seeds I might be using this year. The seeds under test are in a plastic VHS case with a paper towel lining, alll given a good spray of fresh water.
I'll be checking them over the next three weeks to see what the results are.
Here are the seeds and my recording sheet: