So I looked and looked, searched the forum but to no avail. I am throwing the towel.

after upgrading to 1.5 from 1.3.9. I added the payment module, then downloaded the USPS - United States Postal Service for Zen Cart v1.5.0 and copied it to the admin directory. The USPS shipping option still not available after selecting from the menu: module | shipping.

searching for usps
.../zen15/secure admin/includes/languages/english/modules/shipping/usps.php
Line #6 : * @version $Id: usps.php 18348F 2012-01-22 01:22:00Z ajeh $

/zen15/secure admin/includes/modules/shipping/usps.php
Line #9 : * @version $Id: usps.php 18348F 2012-01-22 01:22:00Z ajeh $