[salesman]

Staff members cannot scam you, therefore you cannot scam them...simple.

And to what ziro said, the problem with checking logs and reversing trades on Era is that there is just way too many ways to trade/move/hide an item, each having it's own log file.
There's the itemtrade window, the mall, drop trades, lockers, burying it in the sand, destroying it...It gets -really- messy.