oil leak help

I just purchased a 2013 commander 1000 xt with 800 miles on it from a good friend that i trust.
He changed the oil just before I purchased it. I have noticed that I have an oil leak under the machine. I removed the plastic skid plates in hopes of getting a better idea where it was leaking from. If you look under the machine at the steel belly pan the drip seems to be coming half way, if you will, between the drain plug and the oil filter area. However when i wipe my finger on the drain plug and filter housing cover they are both dry. As near as i can see (which is difficult) I don’t think the front or rear output yokes are leaking. Just wonder how long they can drip from oil that fell in the belly pan after the oil change. i have ridin it probably 150 miles since I bought it you would think that it should have drain off the oil that fell in the pan from changing the oil. This weekend I am going to take the driver and passenger engine covers of and see if i can see anything. My friend said he never had any leaks before he changed oil and I really believe him. Makes me wonder if he didnt tighten or put something back together correctly when he changed oil. Like I said the drain plug and oil filter cover seem to be dry. Man any help what I might look at would be great from you guys that know a heck of a lot more than I do. Hope I dont have to take it to the dealer.
Thanks in advance
Laudy