Think about the events below. Which event must have happened first?

Rebecca read the note that had been stashed in the chicken-shaped cookie jar on the counter.
Rebecca saw Aunt Betty's bathrobe-clad neighbor plop down in his yard holding a newspaper.
Rebecca and her cousins made up stories about the chickens that decorated Aunt Betty's house.
Rebecca and Jack took a train ride through the picturesque countryside to a hotel in Paris.

Rebecca saw Aunt Betty's bathrobe-clad neighbor plop down in his yard holding a newspaper.