When Charles Mallison passes through Jefferson at the start of World War II in "Knight's Gambit," he thinks how soon newspapers delivered by the "RFD carrier" report the news of the local young men who have been killed in the fighting (251). The federal "R[ural] F[ree] D[elivery]" system brought mail directly to Americans who lived in the countryside, away from post offices.
"By the People" notes that symbolically "now," because farm families made so many of their purchases by mail, the "R.F.D. carrier" is "by proxy tailor and seamstress to rural America" (87). ("R[ural] F[ree] D[elivery]" brought mail directly to Americans who lived in the countryside, away from post offices. According to Wikipedia, the service began in Mississippi in 1901.)
It's likely that in The Mansion "the mail carrier" (33) and "the mail rider" (140) who deliver the mail to Frenchman's Bend are the same unnamed person. As the "rider" he delivers a "special wrote-out private message" from Hoke McCarron to Eula Varner (140). As the "carrier," he also gives Mink a ride to Jefferson, until he kicks Mink off the wagon for accusing him of stealing his five-dollar bill (33).
The "lank, goose-necked man with a huge pistol strapped to his thigh" to whom, at the end of Flags in the Dust, Horace gives the letter he has written to Narcissa back in Jefferson (374).
In "Vendee" and again in The Unvanquished, what Bayard first sees as a "thing hanging over the middle of the road from a limb" is quickly and chillingly recognized as the body of "an old Negro man, with a rim of white hair and with his bare toes pointing down and his head on one side like he was thinking about something quiet" (111, 177). Grumby has apparently lynched him to serve as a graphic warning to the boys: pinned to his corpse is a badly written note telling them to "Turn back" (111, 177).
The second lawyer Ruby hires in Sanctuary to secure Lee's release from Leavenworth may work in Kansas or New York City - the narrative is unclear. She pays this second lawyer with money, "all the money I had saved" working in New York during World War I (278), and he finds a "Congressman to get [Lee] out."
In Sanctuary the first Leavenworth lawyer whom Ruby hires to secure Lee's release from prison allows her to pay him with sex, but never tells her that he cannot do "anything for a federal prisoner" (277).
Monk's court-appointed defense attorney in "Monk" is very inexperienced. Recently admitted to the bar, he "probably knew but little more about the practical functioning of criminal law than Monk did" (42). He neglects to enter a plea of mental incompetence, because either he "forgot" or "pleaded Monk guilty at the direction of the Court" (42).
The "hired lawyer" in Absalom! (245) who seems to be responsible for sending Charles Bon on a collision course with the Sutpen family is an extremely elusive figure. He may have been the "legal advisor and man of business" to Bon's mother in New Orleans in the 1850s (252) - or he may have been invented by Shreve and Quentin in a Harvard dorm room in 1910. Outside Chapter 8, the only hint of his existence is in Mr. Compson's ambiguous reference to "the shadowy figure of a legal guardian" in Bon's life (58).