Little update:
They come on my arm now
. They also start to understand when I call them "I always do the same whistle + tongue clacking sound to call them) when they are flyingg aound, it's not a 100% but as soon as they see my arm raised (horizontally oc)/hear the sound they understand what I want and start coming even without seeing a treat.
They start to explore my room and become more daring. They even went on my bed once which is pretty much the "bottom" for them.
I still cannot get them to climb on my finger in their cage/outside the cage XD. These cute monsters really start chewing on my finger which is sometimes pretty painful, I don't know why they do that and how to fix that, for now I just go away from the cage. Also they chew/bite my neck/ear sometimes, I instantly push their beek away/my finger/hand scares them, so they stop, but what's cool, is that they aren't that scared anymore they won't fly away, but will just stay on my shoulder and stop
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They start to be more habituated to my hand. I can give Coco a treat and sometimes even touch her feathers without scaring her (I mean, she is suprised and freaks out a bit, but only for 1 sec, until she realises that I'm doing nothing XD). Also I can touch her beak and get near her beak with my fingers without her attacking me 70% of the time.
Snowball is still freaked out of my hand, if I try to approach him, he back offs. That surprises me, because he was fed by hand from birth on and is supposed to be more habituated to hands. Maybe his owner scared him. I think that he used the "lights out and I'll get you back in your cage technique" which was probably terribly scary for both birds.
They actually are together in their cage again. Two days ago they flew back together into their old cage and it was not possible to separate them, but since they are way more friendly to eachother I decided to let them together. Also it was just not possible to get them into another cage separated again. They groom eachother and they finally sit really close to eachother sometimes. They also regurgitate sometimes. Snowball talks more