They had a weapons amnesty in this country a few years ago. No Stg 44s turned up as far as I know but I seem to remember seeing a Bren gun on a news report. I hope that wasn't melted down. But some of the so called weapons handed in weren't exactly illegal. Knives, Swords, starting pistols and replicas even an ancient musket. Some of them would have been valuable. People are stupid.
I collect occasional bit of militaria and some of them are quite valuable now. Even a standard WW2 GI M1 helmet can go for several hundred dollars these days. But WW2 German helmets and equipment can go for silly money. Yet people still dump them without thinking. On one collector forum there's a guy who works in recycling and scrap yard in the US. He regularly picks up militaria worth hundreds of dollars that people just throw away. I hate to think what gets lost every day.