..Is there anything I could place inside of the racks that would help absorb
moisture from the air inside of the closed racks?


You might try saving a couple of "Do Not Eat" silicant packs from shoe boxes
and putting them in the cases. You can't buy them (controlled substance) so
you might try looking in open boxes at dept. stores or Payless. Their
purpose is to absorb moisture...just a thought.

best,
Brian