I've found my shiny but I still have a box of Eggs.
Can I release them as Eggs or do I have to hatch them ?
There isn’t a way to release eggs, you just have to hatch/trade them. I recommend using a Pokémon with Flame Body and a Roto Hatch, and just start hatching them and once you’re done you can release them.
Hope this helps! :)
You have to either trade them away or hatch them. There's no other way, unfortunately. Guess GameFreak thought it'd be too immoral to just leave a bunch of unhatched eggs lying around.