Maybe it's different in US, but in UK all deliveries from Amazon are done by 3rd party companies - DPD, Hermes, Parcelforce, etc, even if the tracking website says "Amazon Logistics" - it's just a front company.
> Drivers are independent contractors with a delivery provider.
> The programme is open to single driver owner-operators as well as larger companies.
I've certainly had deliveries come in unmarked white vans without the driver displaying any sort of company affiliation.
Are you sure about that because all deliveries I have had are clearly not from any of the regular companies you mention?