The normal scam is. I wanted to sell 9000Pro for £900. The buyer sent a cheque for £3000 and stated his secretary had made a mistake and for me to send him back the difference £2100.
I suspected his cheque was fraud and I took it to the bank for them to check. Yes it was from a stolen company cheque book. The bank past it onto the fraud squad. He had no intention of wanting my 9000pro.....just my money.