As I understand, heirloom seeds will sprout after years of storage because they are heirloom. The hybrids may or may not sprout (germinate) after a few years of storage. Experts also say that vacuum sealing will eliminate positive germination. Store in paper envelopes and keep in a cool dry closet, or under the bed. Mice will destroy the seeds if they get in, but cats and mouse abatement takes care of that.
Approach with a calm resolve, attack with reckless indifference. Gladius Republicae!
"...use Gold like it's gunpowder..."