These small 16 or 18 lead CPUs are worth about $400/pound. The larger 40 leads are about $200/pound.
http://www.cpu-galaxy.at/
I am very familiar with these parts. I owned a very profitable company (actually, 2 different companies in L.A.) that took these reject parts, removed the lid and chip and wires, selectively stripped all the old plating and braze chemically, and replated the packages. The packages were then reused for new chips. Our main customers were Intel and AMD. We ran about 100,000 of these per week. We charged half the price of a new package ($.70 then, $5 now) but, since we removed more gold than we put back on (due to the gold braze), our process was paid for by the extra gold we removed. Our customer's reject rate, when using our restored packages, was less than when they used brand new packages. This process is still viable for many types of newer CPU packages. It also works for most all hybrid packages. As far as I know, I'm the only person left on the planet that knows how to do this. Want to buy a process?