- Okay, Herr Preisshoffer, let's have the mailbox.
- The what?
- The one you took out from the corner of your bunk and put in this pocket.

9 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 01:50:00.494 in the Blu-ray version of the movie.

Quote context

[...]

- He's a Nazi, Price is. For all I know, his name is Preissinger or Preisshoffer.

- Oh, sure, he lived in Cleveland, but when the war broke out he came back to the fatherland like a good little Bundist.

- He spoke our lingo, so they sent him to spy school and fixed him up with phony dog tags.

- He's lying. He's trying to get himself off the hook. He said shut up.

- He said shut up.

- You heard what he said.

- Okay, Herr Preisshoffer, let's have the mailbox.

- The what?

- The one you took out from the corner of your bunk and put in this pocket.

- Let me show you how they did it. They did it by mail.

- Mail?

- That's right. Little love notes between our security officer and von Scherbach with Schulz, the mailman.

- Here's the flag. They used to put a loop in the cord. Did you ever notice?

- And here's the mailboxes. Hollow black queens. Cute, huh?

- They delivered the mail or picked it up when we were out of the barracks, like for appell.

[...]