Air Box Removal K&n Pod Filter Hole.

I’m just gathering the bits to do a airbox removal on my 2006 Scrambler once the weather warms up a bit. I’m getting the bits slow time and recently got two K&N RC 8090 pods filters (new) from flea-bay. On opening the noticed they both have a hole in the bottom plate. Looks to be part of the design. Few questions:
Any one fitted these type? Was planning on just blanking them off with a few nuts, bolts and washer but thinking about it could you run the crank case breather into one of the holes? Any idea what the holes are actually for?

 

Joe.
That’s what the makes forums like this great, thanks for the offer but I managed to get one on clearance from Squaredeals.