I understand y u ask this, I was quite surprised when I ordered my ballhead from US and they actually emphasis that the ballhead should be remove from tripod and place in their neoprene bag that comes with it.
I one day itchy backside forget to take out then the tripod roll down and the knob kana one hole.
This is even stated in the instructions to remove it and store in its provided bag in a cool place.
Dun store in dry cabi, the lubricants will dry out.
Just need to use your camera and lenses more often. In addition to low humidity, the best thing to prevent fungus growth is air circulation. Unfortunately, inside the dry cabinet, the air is still, a perfect condition for fungus growth.
I personally feel if the humidity in the dry cabinet is set to below 40%, it's too low if the equipment is left inside and not used for a long time. I typically keeps mine at 55-60% and wont worry if it goes over to 65%. Afterall, all my time in California, never owned a dry cabinet in my life. The humidity where I lived, averages low 50-60%, and high of 70-75%. And I used my camera alot.
My ballhead is always fixed to the tripod legs. And after quite a few months, I am unable to unscrew it! So now, the ballhead and tripod legs are now "married" perpertually. Anyway, they are not the expensive stuff, just standard stuff from Manfrotto, 055 + 486RC2.