FYI, there is ABSOLUTELY no difference in a new or used CPU.
These things are designed for a lifetime of 25 years +. As long as it is not dead, you can NEVER tell the difference b/w new and used on chips.
I'm a computer engineer, I work with these electrical conditions every day. Your statement is NOT true. Static damage is not a "binary" condition. Transistors (particularly the CMOS variety we find in modern ICs) can be slightly damaged (via IC biasing or damaging the connections to the Gate port of the transistor) so that they are electrically unsound. This won't cause the IC to fail immediately, but it can drastically shorten the lifespan of the IC and make it less tolerant of voltages, current draws, and operating frequencies that it would normally be rated to perform well in.
This is why when your run MemTest to check for errors on RAM, it's possible the _some_ of the RAM in a particular chip is defective and produces errors while not the entire chip is bad. According to your logic, the RAM IC would either be totally fine or totally dead, which is obviously not the case.
Sorry, degree or not, you are simply NOT GOING TO OUTLIVE THE USEFULL LIFE OF THAT CHIP.
Assuming there are no power spikes or surges, that chip will out live EVERY SINGLE component in your laptop. BAR NONE, EVEN IF IT WERE USED HEAVILY by the previous owner.
You may be an "engineer" but as most people on this forum will tell you, I see, test, sell, and use more chips in a week than most people on these forums see in 10 lifetimes
(nothing personal gents, it's just the honest to goodness truth).
AND FYI, your RAM IC analogy is completely flawed: 99.9999% of the time what fails in RAM DIMMs is the PCB and soldered resistors, NOT the ICs. This is why several guys (some even on this forum) make an ABSOLUTE FORTUNE buying "bad" DIMMs, removing the chips, and soldering them on to new boards. Occasionally you get a bad chip, but most of the time it is either a PCB or solder problem. This is also why the failure rate of memory for large OEM companies like Micron is much lower than say Kingston - - - EVEN when both companies use the EXACT same chips. The OEM companies invariably have much better PCBs.