My ORIGINAL Sten from Fazakerly was in Operation Market Garden, captured by Germans, then captured by Patton's 3rd Army and brought back pre-1968.
People pay $7-10k for original Stens with amnesty paperwork and a little background proof. A buddy of mine has a Royal Navy Sten Mk. I that is worth $20kish
FedGov over exceeded their authority and created a limited market. Demand has only gone up. Simple Econ 101.