Yes, the file box is my "coffee kit" - Aeropress, kettle, two double-walled travel mugs, a vacuum flask, and a tin of coffee.I like that setup. Is part of the current Kitchen kept in the file box as well?
I've started keeping that separate from the main kitchen because I don't want to have to worry about moving that gear between the "big" kitchen and my smaller "solo" kitchen if I'm going out with or without family. It also means I can keep the coffee in the van and either brew a pot on my single burner inside (when it's really cold), or easily grab it when I'm up before dawn for photography, etc. Usually, I even remember to fill the flask with water the night before so I can brew up without having to run the water pump while the family sleeps.