It is wise to be very suspicious off ALL players in ESL. FAO's are no more trustworthy than anybody else!

Yep, they are all tricksters as a rule. And the sheilas are less trustworthy than the blokes. It's good that you have brought this up again lest we become complacent and are duped as a result.
And FAO's in China who are members of the Party are less trustworthy than those who are not, in my experience. Beware of them most of all. They'll try to get you kicked out of China under trumped-up charges if you make them lose face.