These are trays for the board game power grid. The trays are low enough so 3 maps can be placed on top of them while still being able to normally close the lid.
The resource trays are rounded on the inside, so it's easy to take the resources out of the box.
The money trays are angled and have a cutout to make it easier to take the money.
v1.1:
added tray for cards
v1.0:
only trays for the money and resources.
The author marked this model as their own original creation.