In the Ravine by Anton Chekhov

The elder son Anisim came home very rarely, only on great holidays, but he often sent by a returning villager presents and letters written in very good writing by some other hand, always on a sheet of foolscap in the form of a petition. The letters were full of expressions that Anisim never made use of in conversation: "Dear papa and mamma, I send you a pound of flower tea for the satisfaction of your physical needs."

At the bottom of every letter was scratched, as though with a broken pen: "Anisim Tsybukin," and again in the same excellent hand: "Agent."