You should still inspect the bud at this stage for later comparison. It's a learning thing.
When I use a cardboard box I didn't find the need for a fan. Just the opposite. Open the box for 15 min a day. IMO a fan will speed dry your bud effecting taste.
As long as your RH stays in that range you will be fine. I don't know the numbers for RH a quick search on humidor should show some good diy with RH numbers