The Tax Office holds unclaimed property tax overpayments made within the last three years and outstanding (uncashed) refund checks. This brief but important letter notifies a customer that he or she has overpaid you.It can serve as a very good customer relations letter. The salary overpayment resulted because . Marilyn Burgess, Harris County District Clerk 201 Caroline, Suite 420 Houston, TX 77002 (832) 927-5800 The District Clerk's Office accepts the following forms of Payment: 1. Cash Bring your cash payments to the Civil Courthouse.