I sold a car on ebay long time ago and got a check for 2k over the balance for the car ......same scam.
but I didn't fall for and checked the background of the cashiers check at my bank and they called around and confirmed "SCAM" so we took the check to my local sheriff's office and they really could not do much since the alleged scammer was supposedly in Canada.....he would have had to have been here in Colorado to pursue him .....but oh well, that was interesting experience.