as has already been said badgerbeek, ventilation, top and bottom.
also, as scott said drones or workers with deformed wings came from the package bees you received, and also, changing out the frames to another box will not matter as far as the mold is concerned.
i am in a river valley. it's damp, and nights are cool here in the spring. we had frost on the ground one morning last week, and it's been raining off and on, and all day today. although a little northeast of me, you are probably experiencing some similar weather patterns?