They do not.
Amazon should truly setup another entity called something else and understand that if they want more MCF, they need to better mask their identity for reasons just like this.
They should know that a small percentage of the population, and folks like Walmart, don’t want to see Amazon on anything that wasn’t actually purchased from Amazon…
Amazon makes their money, everyone else is happy. Easy
It doesn’t show on the USPS site; however … in the USPS system, it will show who purchased the label … which would be Amazon as USPS collects payments from Amazon.
Just not visible to the consumer on USPS site.
Update for anyone who was interested. Walmart update their policy and now we allowed to ship Walmart orders via MCF in plain boxes. Support confirmed that even if Amazon showing as “Shipping Partner” its okay.
Thanks for the update @profugocreator !