But I had an incident with LGA4677 CPU0 socket (x13DEI), one of plastic nut holders broke off from cooler (which is not a problem by itself since nut can still be used to tighten the heatsink base on the same bolt), I've picked all the fragments (I thought) from the bottom underneath of it but as it turned out one tiny fragment was stuck inside the heatsink and fell off onto the socket during the installation, I didn't noticed that and started tightening, more than a half way through it felt wobbly so I've decided to remove it and check just to be safe (as at that moment I've assumed it's just strange spring reaction to tightening).
black plastic was on it preventing from right seating and folded 3 pins in one of those
red-marked areas (can't remember exactly, and base pic is googled from different MB)
Good thing intuition was triggered and I didn't go for full tightening (would have to throw MB away).
So had to use microscope and wooden tooth stick (those sold in packs of hundreds in pharmacies) to gently fold pins back in right position without breaking.
Previous (unrelated to issue of potential socket damage) CPU was ES - 8468V with D0 stepping, didn't have any life at all (although has some challenges with tightening in the beginning, was overly cautious and wasn't tightening it to the end until sensing right resistance level, good thing RolloZ170 brought some more confidence), which even after right seating was always displaying FF boot code (no any boot).