the letters were written between 1956 and 1961 , and some were signed with " comic pseudonyms " such as " the prisoner of zenda " and " r. bouverie pusey . " the signed and typed letters were written to lee 's friend , new york architect harold caufield , between 1956 and 1961 , according to christie 's , which is selling them on friday . despite her towering stature in the literary world for her blockbuster novel , “ to kill a mockingbird , ” little is known about ms. lee ’s personal life , politics or writing habits . a collection of letters written by " to kill a mockingbird " author harper lee failed to sell at auction friday at christie 's in new york . four of the letters by lee , to one of ... ( associated press ) the archive had been expected to bring as much as $ 250,000 at christie 's , which said the bidding did not reach the reserve price . it 's the first book from lee , 89 , since her classic " to kill a mockingbird " was published in 1960 . the consignor collects rare books and manuscripts as a hobby , according to the union - tribune . now , as new york ( ap ) — six letters by " to kill a mockingbird " author harper lee to one of her close friends failed to sell at auction friday .