During WWII the Nazis launched an operation to forge and distribute British bank notes in an attempt to crash the economy. They weren’t initially planning to spend any of the fake money, they were just going to drop crates of cash all over Britain hoping locals would find it and put it into the economy themselves.
You better believe that anyone caught aiding or abetting such a plan would have been subject to some serious consequences under local laws whether or not they personally tried to spend the money on goods and services.