They should have a desiccant when stored in a closed container. If you are in a very humid area, yes, I'd use a desiccant and store them in a container. Since you are in a very humid area, you want to make sure your desiccant is charged, or recharge it.
Fungus will even grow on the glass in camera lenses, ruining them. A saying among photographers is that bags are for transport, not storage. A lot of people don't know about lens fungus, but it seems like it's more of a when, not if. This is a huge factor when buying used lenses.