Attached is a upgraded version of USPS Methods is based on 5.2.1. See http://addons.oscommerce.com/info/487 It is patched and current to 28 July 2013 changes. It works on 2.2, rc2a and 2.3. We've re-tested all options and services and believe they all work.
usps.php 52.26K 25 downloads
Please note the server is still set to staging. Go to lines 821-823 to reset to production.
You need to upload the file to modules/shipping. You need to uninstall then reinstall in Admin. Don't forget to make note of your settings before you uninstall.