I'm not an admin.
You should never blindly trust anyone, having doubts and being careful is helpful in this context. I've explained this a bit more thoroughly in

yesterday, you might find it interesting.
If you do trade, make sure that you guys communicate via PM (make sure to save copies of your sent messages) and be explicit when it comes to stating what you guys agree upon. Also make sure to use our trading system, see

for more information.