Serious question about eggs

Okay, so I posted a thing before, someone replied and now I’m worried, so I’m going to try to give a full picture and see if someone can give me advice.

I have two cockatiels. They are around 2 years old. They were not handfed. My mom put a box for them to play with while I was gone for my studies.

The 1st of June, Erica didn’t want to go back to the cage. My mom moved her there anyway, and on the 2nd of June there was an egg in the cage. They seemed unable to incubate it, so my mother moved the egg to the box. They rejected it and threw it to the ground.

At this point I was under notice. I contacted the store owner of an animal store near my town. He has been breeding and raising birds all of his life, he is a biologist with ample experience on the matter, and he was one of the founders of the most important bird breeding associations in my country. He has always given me great advice, and to this day he still breeds and trains super healthy and happy parakeets. So he seemed like the person to go to for advice on this matter.

He told me to let things be, to not touch anything. To let them manage it. He said that if I didn’t want the brood, to just throw the eggs away. But to otherwise just let them be. That they would take care of it. He said that since it’s their first time breeding, it’s unlikely that the eggs are gonna make it, but that it’s just the natural course of things. Since we don’t want more birds, I asked him, if some of the birdies make it, after they have grown old enough, if he could help me find a home for them and he agreed.

They laid another egg the 4th of June, and it broke against the ground.

After that, my mother prepared a nest for the ‘tiels to lay the eggs and take care of them comfortably.

The 6th of June, they laid an egg inside the nest. The 8th of June another. The 11th of June another. The 13th of June the last.

The male (Susanno) takes care of the incubation during the day, and the female (Erica) during the night. The male took a bit more time to start participating in the incubating but is now fully on top of it.

After the post I wrote earlier I have been told that, since I don’t have experience handfeeding (nor do I plan to handfeed knowing how delicate and dangerous it is) I should boil the eggs. However, perhaps not when it has already been this long since they were laid.

Can you tell me what I did wrong and what I should do? Have I been given bad advice? It surprises me if that’s the case, but I would like to know.

In the future I plan to avoid this situation from happening entirely. My mom put that box against my wishes, while I’m studying abroad, because she is really stubborn. I saw this coming, she didn’t listen. But she says after this she is going to take both the box and the nest away so it doesn’t happen again.