You could probably (at your own risk) try just leaving them alone in a paper bag in a well ventilated, heated and not too humid place... For about 10 days... If they're not obviously damaged/spoiled... See CDC guidance in case of mask shortage.

If I'm not mistaken, this study seems to indicate it shouldn't remain active more than 9 days on pretty much most surfaces(source : https://www.journalofhospitalinfection.com/article/S0195-670...)