Oil around driveshaft boot

[formikec]

I've been noticing some oil around my driveshaft boot where it meets the transmission. Looking at the drawings on kaw website I don't see any seal that could be leaking. Now (at work) got me curios if it could be coming from the oil drain plug and blowing back onto the driveshaft while riding. I'll check after work, but wondering if anyone has had this problem.

Not a lot of oil, just enough for a small spot after parking, and wet around the rubber boot on the front of the shaft.