there should be oil drooling out IF your tranny was properly filled ...most shops just fill through the side plug and let it go at that ... specs call for another 1/2 L on top of that ... ( thru the speedo cable fitting)BUT the tranny WILL WORK FINE, if low on oil .....
There had better be oil behind that cover on level ground, since that's how the throwout bearing is lubricated, and the clutch arm, and.... !!!
My guess is that there's a mist of oil being thrown around in the tranny airspace that lubes everything.. including the throwout bearing, clutch lever, etc.