Intel Xeon E5-2430v2
This CPU is still in it's original (and unopened) box. It sits there since 2015 and probably many years to come.
The E5-2430v2 was launched in early 2014 for use in dual socket systems. It was not the fastest CPU or the one with most cores but it's price-performance ratio was generally pretty good (depending on your use-case of course).
For reference: with the Ivy Bridge core Intel also had 15-core parts available or 6-core parts that run at 3.7 GHz. Ivy Bridge came in many configurations and price ranges. On this page on Wikipedia shows an extensive list of all available server CPU's with the Ivy Bridge core.