Only thing I would really worry about would be transformers or CBMs (copper bearing motors) on low-grade boards. If they are large enough or are on the board with a fair amount of exposed copper, I would remove them. CBMs fetch between .20 and .25 per pound depending on the local market for copper, but some can broken apart and the copper recovered with very little effort. Search youtube for Moose Scrapper as he posted a video with some common types of CBMs that can be broken apart for #2 copper.
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