Audit logs for before I turn on audit for scheduling and workflows

Summary:

Team - This is a question to deal with some requests from our auditors. On discovery we have realized that we do not have the audit turned on for 'Enterprise Scheduling Service' and also for 'SOA suite' (Workflows). However, we are continually being asked if this information can still be provided for the previous year. Is it possible to get those audit reports for historical data even if I set the flag on only recently.

I answered that this would not be possible but want to ensure that my understanding is correct.

Appreciate all your guidance.

Content (required):

Version (include the version you are using, if applicable):