I really like Pistone's suggestion. Nothing replaces experience. If they take in ewaste as in towers are just tossed in the shred pile I would get all those I could.
There's lots of threads here involving how to break down various things. In particular there are several dealing with electric motors. I buy motors from my next door neighbor for .20lb and extract the copper. I do ok with it but you might hate it. So go beat the copper out of something and let us know how you like it. Miked.
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