Senku is a very resourceful type, I'm sure he can find things for Caleb if he asks him for things. He also still has his arms band. Some of the items he used to have in it are not there anymore, because they decorated their room, but he still has a lot of things.

Ha, you're gonna be surprised Casper, Prom is actually decent at stealth. Despite what his experience on the last mission was XD

Someday soon in his future at home he destroys a whole military base by himself. He's a good boy.