just a FYI, some nuts that comes off of high voltage NON PCB transformer has brass nuts, and also some servers with the strips of fins are also brass, but some are copper, you've to get them checked out, so if you're breaking down server cpu heatsink, they may look like copper but some are not copper, so, check them break them in half and use a magnifier to see the ends to see if its brass or copper, I've come across a slew of server that has brass for heatsink with copper in the middle ..
So, happy brass hunting.
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