going to have to take a picture or tell us which hose is going in there..that is your breather box..there is a hose that goes from the motor into there as well as the pcv hose..if one of those is missing just replace it with another hose
IIRC, there's only one hose that goes into the box. And yes that box is for your PCV valve. You can get to it without removing the intake manifold. You have to remove the intake manifold bracket underneath (it's actually a very pointless bracket that doesn't do anything).