Real simple, make a starter. If you do it today, you'll know if the yeast is good.
Dried yeasts will last a year or two as long as they have been kept cool.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk