What did Mr. Dressler discover in Mrs. Starch's mailbox?

In the context of the story surrounding Mr. Dressler and Mrs. Starch, Mr. Dressler discovered a letter addressed to him in Mrs. Starch's mailbox. This detail is significant as it establishes a connection between Mr. Dressler and the events related to Mrs. Starch, serving as a plot device to develop the narrative further. Letters often symbolize communication and can reveal key plot points or character motivations, which might lead to unfolding events that affect both characters' interactions and the overall storyline.

The discovery of a letter is more impactful than finding a birthday card, a school assignment, or a donation request because it implies direct correspondence, potentially indicating an ongoing conversation or a message that could be pivotal to understanding their relationship or the circumstances surrounding them. This element of letter discovery could lead to new revelations or conflicts that are central to the development of the characters and the plot.