C1176 I Know the Rules
Having three demi-humans as his lackeys wasn't only due to the three free meal tickets. More importantly, Lee Yunfann had three tour guides.
Although Lee Yunfann had Golden Horse City to give him a map, it was still left behind by who knew how many versions of an antique map.
If this was in the early stages of the construction of the city, then perhaps the map could be considered detailed