mhlyons 
One of the best ways to learn is by experience. If you do not know if something is worth taking apart or not, do it anyway. If there is nothing in it worth separating, then next time you will know just to toss it in the mixed pile as is (after removing the power cord). If there is non ferrous in it, next time you will know you need to take it apart. A person remembers better when they have hands on experience.
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