How do we have sheets without an Owner in our system?

Pauline J
Pauline J ✭✭✭✭✭

I ran the Sheets Report as part of our ongoing continuous monitoring of access to our company data in Smartsheet (as we do allow outside collaborations). Today I see that there is a sheet shared to an outside email address, (Editor) which is fine, but there is no internal user listed as an Owner or Admin. I thought that all sheets had to have an Owner? What is best practice here; how can I, as an Admin, monitor this sheet?