6-pack tray, so I had to put the cooked eggs (after they had cooled down) in with the uncooked eggs.
An easy way to recognise the cooked ones, would be to mark each egg (using a pencil) with a X on the top.
But you don’t really have to do that.
In case you did not marked the eggs, just take any egg and
spin it on your worktop, the egg that spins freely is a cooked egg.
Why do the uncooked egg spin so sluggishly?
That’s because of the yolk and white is laying loose inside the shell.