Pitch it. Since you said packet, I'd assume you have a dried yeast. 80F for a week is nothing. Even for a liquid vial, it's not a big deal.
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