That's what I'm saying - it depends which directories Feral used when they ported the game. If they used some of the more sensitive directories then chances are Finder will be hiding them from you, or lists them somewhere you wouldn't expect to find them, so it won't be as simple as it could be to place the OGAM files in the right folders is per the readme that is with OGAM (you did read it right?). Also, I'm assuming that you did search for a BW2 directory to put the files in yes?
EDIT>>
so for example, the readme here lists all landscape files as going in Data\landscape\BW2, and I see no reason why Feral would have changed the relative structure of the games' directories when they ported it, so all you have to do is find the games' own directory, and from there you should be able to find Data\landcape\BW2
Large Hadron Collider - because fleshlites are for wusses