Hi, what's the easiest way to track what ticket number an email has been added to?

We have an email that I can see was sent on 17/06/2024 at 15:25:52. It was processed by ServiceDesk, but we can't see where it's gone.

It wasn't created as a new ticket.

It didn't have a ticket ID in the subject, so it shouldn't have been added as a conversation reply.

Is there a log somewhere that will show what happened to each email that was processed?