We are having a problem and can't seem to find where to fix it

Our students have discovered one of the staff override pins but we can't find the staff member who's pin it is.

We have gone through all iterations of staff/admin accounts, even the deleted ones, but still can't find the pin that the students know.

Is there any way to get a list of pin's on a spreadsheet or search for a specific pin so that we can eliminate it from the database?