Re: USPS, make sure you sign up for Informed Delivery, which sends you a daily email with images of the mail you are due to receive that day, as well as tracking numbers and/or senders of any packages due for delivery that day and in the near future. The package delivery can be off by +1 day or so on occasion, but it allows you to file a missing mail claim easily. I've actually had a USPS carrier come to my house specifically to deliver a critical missing package (meds) after I reported it. You may not always get this same service, but it always helps to do what you can to track your own mail delivery. Just my $0.02.