What is your proposal for an alternative to FedEx, UPS, USPS, Royal Post, etc? Thousands of small independently-owned shipping companies? How would that work when you need to ship a package from/to arbitrary locations in the entire US/world?
IMO, shipping networks would be better off shared across all the delivery companies and services. Then there would be an increased need for transparency and accountability for all packages.
No need to build alternatives, properly funding and authorizing the regulation agencies and courts so that they can do their jobs should be more than enough.