Hi Orzala,
If the box is too small, then the chicks will end up getting crushed or dying because the hen can’t get to them. A parakeet nest box is quite large, and needs to be able to hold up to 6 parakeets. The chicks will be nearly full size before they leave the box, except the tails will still be short. And often both parents will be in the box with them. So if you know the current box is too small, you are headed for a bad situation if the eggs hatch. Moving them will almost certainly result in the hen abandoning them. Unfortunately, you potentially have a no win situation. But if the chicks won’t fit in the current box, it’s better to move the eggs now. She may move with them. But it’s better to have her abandon the eggs than to go through weeks of work sitting on them, only to have the chicks die due to a box that is too small.
Thank you for asking Lafeber,
Brenda