What happened to the letters Sarah wrote to papa IN Sarah PLAin and tall?

In "Sarah, Plain and Tall," Sarah writes letters to her father, but they are never delivered. Instead, they are found by the children, who learn about Sarah's feelings and experiences. The letters reveal her longing for her family and her connection to her past, highlighting her emotional journey as she adjusts to life in a new place. Ultimately, the letters serve as a bridge between her former life and her new one with the family she grows to love.