Terraforming Mars credits storage (narrow x2)

This is a remix of https://www.thingiverse.com/thing:4369131. It's been shrunk to fit in the box next to the game board, and to hold exactly half of the credit tokens (print two to place on opposite sides of the table).

Ideas for improvement:
* The box lid may flex outward slightly when inverted while closed. Add a groove for the back of the lid to slot into.