Here's some background info. Nothing interesting yet….
https://fortune.com/2013/11/13/amazons-deal-with-the-usps-for-sunday-deliveries-is-weird-heres-why/
https://www.prc.gov/Docs/88/88446/13-11-27%20Amazon%20opposition.pdf
Postmaster in 2013 was Patrick R. Donahoe
https://en.wikipedia.org/wiki/Patrick_R._Donahoe