So... a game of chance.
Having heard your description of the mystery box, Rosetta lets out a subtle sigh. After a brief consideration, she has seemingly made up her mind.
Can I delegate the task of opening the box to you, Commandant? I don't need to be the one to open it if we're hoping to share the surprise.
You take the mystery box back from Rosetta. It feels heavier now, bearing both of your expectations.
You trade a week of luck with a small bonfire-shaped night light. You turn it on, and the soft, warm light illuminates Rosetta's face.
I'm glad you are the one who opened it.
Do you remember the bonfire we lit in the Arctic? It looked as heartwarming as this. This light belongs to us, and I will defend it with my life.