Found: H.Fic Short Story - Nazi Germany Undercover Postman

I am trying to find the title of a historical fiction short story set in Nazi Germany.

In the story, a man sends a letter that is somehow incriminating himself or possibly a loved one. When he finds out that the German government is going through all of the postage, he signs up to join the force that is going through it in the hopes that he finds his own letter. After a good bit of time passes, he does in fact find his own letter, but he's been so indoctrinated that he turns himself in. .
I read this at some point in either late elementary or middle school, between 2011-2014, in the United States. I don't think it is Address Unknown by Katherine Kressman Taylor. It's entirely possible that it was part of a textbook, but I don't think it was.

Thank you for any leads!!

I think I remember the same story, but I thought of it as being set in Latin America, so I don't think it actually specifies the timing or location. A man joins the censors, and gets so good at it he rises through the ranks, and when his own letter crosses his desk, he censors it.
I remember it ending along the lines of "and so naturally, we had to kill him," and I got the impression it was written from the point of view of the revolutionaries?

That sounds exactly right!!

The Censors by Luisa Valenzuela.

https://southerncrossreview.org/3/censorseng.html