Take a pair of scissors, sturdy ones, like kitchen scissors, and cut the little plastic wavy pieces off of the front of fan. It works, trust me. Then place them in your cooler, I assume you have a cololador, in a fashion that the one pulls the air from the other. Even though they don't move much air, they will circulate more air then you think in a closed environment. The only other option that I can think of is the computer fans and I'm not in wiring those things. You can also take the oust fans apart and wash the plastic, not the circuit boards, and get the air freshener scent off of them that they picked up in the package. Removing the wavy pieces helps move a bit more air. If you can wire the computer fans, go for it. I'm not even trying.
On the other hand, I don't have fans in my other cooler, where I keep boxes, I keep a whole pan of beads in there, and I open it once a day and fan it with a magazine or something and it works just fine. The abundance of beads stabilizes the rh quite quickly.