Call recording deletion not evidenced in Explore or audit logs

My compliance team recently requested a report to indicate that call recordings were indeed deleted before a certain date. I could not offer them anything because that data point is not found via Explore. Also, in audit logging, that automated deletion is not shown there. Zendesk support was contacted and they confirmed this was true (#12079971).

It would be great if there were a data field to aid with this. On a broader scale, perhaps even a length of recording (where 0 would suggest that the recording was no longer available) data point in Explore would be helpful for this and other analyses.

Or, some record of automatic system deletions in the audit log.