Finding Bind variables in SQL's executed...

v$sql_bind_capture --> this view shows the bind variables passed to the sql at the run time
DBA_HIST_SQLBIND --> historical information

Ex:

select b.last_captured, a.sql_text, b.name, b.position, b.datatype_string, b.value_string
  from dba_hist_sqlbind b,
       --gv$sql_bind_capture b,
       v$sqlarea a
 where b.sql_id = '66j3kkqnv3m2f' --> sqlid that you are interested in looking for bind variable passed.
   and b.sql_id = a.sql_id

From Oracle Docs on DBA_HIST_SQLBIND:

DBA_HIST_SQLBIND displays historical information on bind variables used by SQL cursors. This view contains snapshots of V$SQL_BIND_CAPTURE.

LAST_CAPTURED

DATE

Date when the bind value was captured. Bind values are captured when SQL statements are executed. To limit the overhead, binds are captured at most every 15 minutes for a given cursor.