I’ve also seen ORANGE CONNEX on a few occasions. I’ve signed up for USPS notifications so that as soon as any package enters their system that targets my mailing address, regardless of origin, I know that a package has “arrived” on US shores … and I can see its subsequent progress.
I order parts off of eBay. In many cases, the supplier will ship, as Paul stated, via a "package bundle". Sometimes U.S. vendors do the same thing using DHL or FEDEX. Recently, I've seen the Chinese suppliers using ORANGE CONNEX that usually ends up in Bensonville, U.S. and is then relabeled with a USPS tracking number and sent via USPS. I've seen typically 2 weeks shipping time from China. Sometimes the vendor charges US$2 to US$4 for the shipping and sometimes its free. You can track the package from China to the U.S. via ORANGE CONNEX but afterwards, you don't get the USPS tracking number, so the package can't be tracked once it passes through U.S. customs, which can take 3 - 5 days (slower for caution due to China's attack on U.S. using bio-weapon CV-19). Once shipped via USPS, typically 3 days to arrive to your door.