My August adsense check was lost in the mail. I did some research and discovered that a request adsense reissue can me made 60 days after the check was issued.
Here's the link ot request an adsense check reissue: Request check reissue - AdSense Help
If you are still getting a check in the US via snail mail, the best thing to do sign up for EFT payments. I did this last month and the EFT adsense payments are super fast. I got paid before the end of the month.
Here's the link: Signing up for EFT payments - AdSense Help