I don't know what they are worth. Hopefully, someone else will chime in.
The scrap metal places here will take your tag number and your picture for their records when you bring in certain items. Then, the police check the records every few weeks for stolen goods. We have a lot of copper and catalytic converter thefts.
As a result, I no longer recycle anything. Too much of a hassle, plus I'm not taking a chance of being mistaken for a criminal. Sucks that a few bad people ruin things for the rest of us.