1. Stalk the mail man/woman
2. Don't worry about it and check it later that day
3. Use tricks to know when the mail has come
4. Your know when the mail will be here (within 10 mins)
Personally, I open the mailbox door just a little bit so I know if it's shut close, the mail is here (and I know he comes between 1:00pm and 2:00pm...