Crankvase breather vent hose runs to the airbox.
The back end of the airbox is it's lowest point and if I remember correctly, there are 2 drain hoses that run downward below the battery.
You will get some drips out of there especially if you overfill the crankcase slightly with oil.
When I still had an airbox, I used to put a peice of cardboard under the center of the frame to keep the drips off of the floor.