If the bags have been exposed to the air, they have probably absorbed all the moisture they can.
I have one of these:
Amazon.com: Reusable desiccant canister: Industrial & Scientific Left in the open air it saturates within hours. Best for a very small air tight container.
Air conditioned/humidity controlled environment with air circulation is going to be your best bet. My office equipment is stored outside any bags or containers in an horz. file cabinet. Some of the lenses are 25-30 years old and have no mold problems.