Considering that we can possibly only have 1 reset or no reset in this chapter, the chance of having something very important at school during the reset is very high, so it makes sense that it takes so long to have the reset.
And another thing, when Akira finally had time to think about what he could do to bring Maya back at the beginning of chapter 3 he instinctively thought about Maya's boxes.
And another thing, Ayane saw what was inside the boxes and was a little desperate/surprised at what was there so much that she thought it could help bring Maya back.
And considering that Ayane had this memory about the boxes and what was inside them was erased, I think it contributes a lot to the theory of what is inside the boxes, it could be very important information about this supernatural world or about how to bring Maya back now that Ayane thought what was inside could help.