Most CPUs of any LGA style package have subtle imperfections like that if you look hard enough.
It's nothing to worry about. The pads aren't discolored, and in fact the pads aren't really even to blame. The bottom of the interposer (where the LGA pads are) is covered with solder mask. The...
Of course you can't get a $6k CPU for $200. While Engineering samples are typically much more affordable, I would still expect prime condition 7702 ES chips to sell for at least $1000.
The chips you linked for sale are that cheap because they have missing and/or damaged capacitor networks...
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