Board Thread:General Discussion/@comment-11188061-20141008045121/@comment-11188061-20141106101514

It wasn't exactly luck. There's only so many places that one could find, since it had to be close to the Kingdom. That after one discussion with Ozpin and General Ironwood, that the duo can narrow down the possible locations of a hideout to one spot (Oobleck's presence is the confirmation here) means that it really isn't that well hidden.

Moreover, Roman had patrols walking above the city. I agree that it was lucky that Team RWBY managed to find them within such a short amount of time (though dogs are notoriously good at tracking), but their outfits made it extremely clear that they are White Fangs, and Team RWBY are looking for exactly that. It really wasn't that hard to find them after all.