I had the same thing happen. A cashier's check was sent to me for $750 more than the asking price. I was suspicious about the extra funds, so I called the back, which was North Island Credit Union to verify if they had a check with that number and amount that had been issue, and they confirmed it was fraud. I was contacted from two numbers: 705-512-8821 and 705-847-2768. They asked me to send photos to this emaile:
[email protected]. I filed a complaint with the FBI at http://www.ic3.gov, and with the USPS at https://postalinspectors.uspis.gov/forms/MailFraudComplaint.aspx. The parcel was listed as being with a company based in Washington DC, the bank was in California, but the package was shipped from and address in Myrtle Beach... Sellers beware!