We're heavy Amazon.com users in our household. Since I frequently work from my home office, I'm often here when the deliveries arrive. Over the past couple of months (it may have been longer, but that's how long I've consciously noticed it), something has changed.
Prior to this past couple of months, the Amazon packages always arrived via some commercial service (e.g., usually UPS) or via the USPS. Occasionally, that still happens. Increasingly, however, the packages are delivered by private couriers in delivery vans or compact, hatchback cars -- in all cases, completely unmarked.
And, often, a day earlier than promised!
In addition, when delivered this way, the Amazon boxes are different. They're covered with labels full of bar codes, etc., but no "branding" that relates to any courier/shipping service. "Amazon" is the only brand that appears.
Wonder if Amazon is building/leveraging some sort of "Uber for Deliveries". They certainly have the 'ooommph' to do so. Once sufficient scale has been achieved, will Amazon then offer the service to other businesses (or consumers) who need local deliveries, a la the model in which the Amazon 'cloud' originally being used to support internal business functions, but then becoming a hugely successful service available to third parties for a fee?