Maggies Letter

You can get Maggie's Letter after Maggie becomes rich. Put it in the postbox on Windfall Island. Go back to Maggie's house and find a Rito postman fighting with Maggie's Father. After the postman leaves, go to the Coffee Shop and find him. He will give you Moe's Letter. Give this to Maggie and she will reward you with a Piece of Heart.