It is especially difficult to find non-philatelic uses from these stations since many of them had very little postal business. Most examples found are on postal cards sent by collectors for examples for their collections.
Pryor Heights was a rural station of Perrysburg in Cattaraugus County from June 1, 1953 to June 18, 1960 so this is a late use from the station.
River Road was a station of Tonawanda (Erie County) from June 1, 1937 through 1944.
Today, the USPS calls these types of station Contract Post Office or Community Post Offices.