What should I do if some important unknown mail got blown away?

I work a jobs and go to college, and sometime have to shop after work. I was headed toward the house after work and after shopping 🛍, and I had 4 bags counting my gym bag, and checked the mail but it was so windy. my mom's letter(I live with my mom) got blown away out my mouth since my hands were full. It so windy outside it couldn't be found. I pray it wasn't nothing important.