I just want to suggest to upgrade the trading system and add a " Confirm " button. Both players must click Confirm before they can both click Ok. If something is changed in the traded items then the Confirm button of both players gets unticked and they have to click Confirm again. In this way, they can avoid the "Fast hands" thing scamming where players quickly removed the items then click Ok leaving the scammed player getting nothing.
Thanks and Merry Christmas Mercury