Search Billed Sales Orders

I'm doing a search for billed sales order. I know there are at least 1,700 of them in the system. This very simple code below is returning 0 entries.
The problem appears to be with the status I am setting. Am I not setting in correctly? Should I be identifying billed SOs differently?


        Const strTranType As String = "salesOrder"

        smsf.operator = netsuite.webservices.SearchEnumMultiSelectFieldOperator.anyOf
        smsf.operatorSpecified = True
        strTypeArray(0) = strTranType
        smsf.searchValue = strTypeArray
        tsb.type = smsf

        'status
        Dim smsf3 As New netsuite.webservices.SearchEnumMultiSelectField, strStatusArray(1) As String
        smsf3.operator = netsuite.webservices.SearchEnumMultiSelectFieldOperator.anyOf
        smsf3.operatorSpecified = True
        strStatusArray(0) = "billed"
        smsf3.searchValue = strStatusArray
        tsb.status = smsf3