Sorry you haven't gotten any responses. I've been in the airfilter plenum/box and have not seen any oil. It is a "dry" area on my bike. I don't remember the details of the low spots in the box and it is black, dark, and hard to see so I can't say for sure if any oil is in there. I can't believe there is any reason for oil in that area unless you have a (too) wet K&N filter. I have found it to be dry and full of a surprising number of bugs on the incoming side of the filter.
2004 dl650-the urban warrior.
2007 R1200RT - the highway beast