[As you asked master, I've scanned the entirety of the Sin Glades. There are mostly just hidden caves but there's also one that might fit the description of a tomb of riches and, uh, paths?]
"Just please tell me, is it in the same destination as our journey?"
[As it turns out, it is. That's very fortunate master but we'll have to take a tiny, just a little detour to get to it.]
They couldn't afford a detour now, they didn't know whether the human army was in front of them or behind them. In any case, they needed to get to these races before humans could poison their minds.
The riches were hidden, the chances of them getting discovered were very low. He made the wise decision to acquire Orcs and Goblins first before the detour.
