i have never received any bans on my mules. when i trade i do amounts like 50000k and i don't add random items either. the chances of you getting caugt anyways is soo low. i don't see why people are being so worried about this, i just think it's a waste of time and xp to trade items by using methods such as the duel arene, or in low bits.
maybe if you kept trading 2000M to random lvl 3 accounts, jagex would be looking into it, but anything less than 200m they don't give a damn about.