There is no trusted Amazon delivery guy. It's independent contractors mostly.

False, there are lots of last-mile Amazon delivery guys -- I live by a distribution center that has literally hundreds of Amazon-branded last-mile vans that deliver straight to my house.

The program you're thinking of is likely "Amazon Flex" which is just part of their last-mile delivery system and uses independent contractors.

Those aren't necessarily employees of Amazon, you can sign up to be a shipper and buy the vans. https://logistics.amazon.com/marketing/opportunity