A Municipal Report

Hello. I have never used this site before, so I have no idea how any of this works. I figured I would give it a try anyway. I have to write a report about "A Municipal Report" by O. Henry. I just finished reading the story, but it does not make much sense to me. I understand some of the basic things, for insance, what a municipal report actually is, how the characters are related (for the most part), but I do not truly understand the story. For instance, symbolism, irony, foreshadowing, the theme, the conflicts, or why the man was even killed. Some parts I have putten together, but it is like a puzzle that is missing one piece, it is incomplete.
I would truly appreciate some sort of reply from someone. Thank you very much.