The Tax Office holds unclaimed property tax overpayments made within the last three years and outstanding (uncashed) refund checks. There has been an error in your favor!She assumed it was a scam but then sent it to us to check it out. Type a letter to the person who made the payment, explaining that he paid in excess of the amount due. The auditor will be looking for tax underpayments, overpayments and credits already taken for the items in the refund request. The IRS uses Letter 3286C to inform you that they believe you may have overpaid for a particular year and will refund you the difference. Double check whats's happened. Allocate the right amount and leave the rest un allocated. The salary overpayment resulted because .