I keep sets of metric and imperial hex keys indoors too. I also have sets in my shed but I don't want to go outside to fetch them or move them between locations.

I got myself new sets for indoors last month. This was triggered by me losing a couple of keys that came with a 3d printer. I didn't have any before but ball end ones are a lot easier when (as is the case with the fan cover on the printer) accessing the screw slot in a straight line is difficult.