Here's a script to help to unmask those values.
col data_value for a50 accept SQLID prompt 'Enter SQL ID : ' select position , case datatype when 180 then to_char(anydata.accesstimestamp(value_anydata),'DD-MON-YYYY HH24:MI:SS') when 12 then to_char(anydata.accessdate(value_anydata),'DD-MON-YYYY HH24:MI:SS') else value_string end data_value from v$sql_bind_capture where sql_id = '&SQLID';