A new USPS patch has been released for Magento 1:
What common issues do you have to watch out for when applying this patch?
-This patch addresses USPS method name changes starting Sep 1, 2017 - Added Sep 11, 2017
A topic like this exists for SUPEE-10266, which is newer but has a lower patch number. We discovered two problems and one fix for this less known official patch. That is why we created this topic. To help the community with what we found, and to hope to get answers for problems with certain older Magento versions.