I’m was happy to receive one too after cracking some eggs open after the expedition, I may have mentioned it in the thread related to the expedition.
I think if you have an active living ship, the eggs will hatch cargo deflector/economy scanner/aqua jets etc until your living ship has them all and then the eggs will just give the class upgrade modules.
I made a post about upgrading living ships about a week ago I think 
The main take away is, you’ll only get c b or a class of a certain upgrade (grafted eyes I think are only ones that appear as S class) but once installed, you can then spend nanites to upgrade the tech module all the way to S class.