for sure dont say anything involving jsp in game.
Trade should looks legit, for both parts to be safe.
In general you must deliver whisp/trade link to your item if your buying currency.
If your buying big quantity of divs, dont list any random shit rare from the floor but some double corrupt item, uniq megalomaniac etc
you forgot the second biggest one.
Don't trade flippers, if they get banned good chance you will too.