How to Win Friends and Influence Nazis - S3-E7
Stupidity: As Burkhalter tries to straighten the picture of the Führer, he stands right in front of it, looking directly at it. A moment later, Klink walks over and fiddles with the thing. It would be absolutely ridiculous to claim they wouldn't instantly notice the difference between a photograph of a microphone and an actual microphone inset into the picture at this distance.
Answer: It's a comedy, not a documentary.
stiiggy
Perhaps it was counterfeit. There are numerous episodes where they deal in counterfeit monies.