Share 'Craigslist Fraud'

Alright so a few days ago my brother put a bike up for sale on craigslist. He got an offer from a guy that was on a "business trip" and had to pay with a money order. The guy offered him 50 bucks more than what he was selling it for. Which to me sounds very odd. My dumb brother agreed to it. Then he gets another email from the guy saying that his "assistant" sent him a check that was way more tha…