For a long while, Michelle thought about where she could put the eggs so she could go break-mend the spatial bracelet, but she couldn't think of anything. Feeling helpless, though she didn't always want to depend on him, she went to the Archduke for help.
First, he asked her if she wanted the eggs to hatch quickly, or if she just wanted to store them away without harming them. When she said she just wanted to store them away, he gave her a strange box which could barely fit one of the eggs. But when she opened it, she saw endless space.
The Archduke explained to her that the box was a spatial artifact which could stretch and change in accordance with how many living things were inside. Originally, it was his spatial bracelet, but by break-mending it, he got the box. The best thing about its being a box was that, if he allowed it, others could access it too, so he could let Michelle borrow it without any problems.