yes I understand about the air migration while transferring the wires. I am planning to use silicon rubbers to seal the ports so that it reduces the air migration with the wires.
About the idea you shared on reducing humidity, if I bring outside air to the box, then the lowest humidity can be equal to the humidity that is present in the ambient. What if I have 40% RH in room and I want the box to have 20% RH? In that case, what can be used?