I believe this is true, because addressing the reader's name is sort of informal and not suitable in a cover letter.
Answer:
I knew then I had to have a house. A real house. One I could point to. But this isn’t it. The house on Mango Street isn’t it. For the time being, Mama says. Temporary, says Papa. But I know how those things go.
A) to show that the words are not part of original quote
The letter was sent from Frex to her daughter Elphaba, requesting her to help with her younger sister Nessarose Thropp - the woman who becomes the Wicked Witch of the East - who has taken her position as Eminent Thropp of Munchkinland. In the package, Frex sends Nessarose the sparkling glass covered shoes which were made by Yackle (technically, out of glass) as well as ornamented by Frex using techniques he has learned from Turtle Heart. They become a major source of conflict due to Elphaba's jealousy, as she is determined to get them back at all costs, but Dorothy is unable to remove them.
