The above question wants to analyze your writing ability and imagination. For that reason, I can't write this story for you, but I'll show you how to write it.
First, you should think about why this character got the money in the mail and how the character figured it out.
After that, you can write your story as follows:
You can find more information on how to write a short story at the link:
https://brainly.com/question/1638275