seed collection

Discovered something new at the bottom of the box of seeds. There was an inventory created on 31 March 2005 (almost a year to date ago), which lists not only the seeds and amounts remaining but also the year. I wonder if there is a time-sensitivity issue with seeds. Naturally, seeds accumulate in the seedback, but I wonder if it is different with these. Were they grown organically? Would that make them more or less susceptible to timing? I wonder. And it may be a good idea to make note of the years in which these seed packets were purchased and used, as well as their future successes upon cultivation.