In CPQ How can you determine who owns a report that has been shared on the REPORT MANAGER screen?

I need to know where in CPQ I can look to find out what user has created some of the reports that are Shared in the Report Manager. There is nothing on the Report Manager page that indicates the owner. It will be very time consuming to Proxy login as each user to look in their report manager. And in the case of users inactivated, reactivate them to proxy login, just to determine who owns the reports. I have many reports in our shared list that I need to "unshare".

We have asked our users to put their name in the Description so that we know who did share but I have many reports that no one has claimed and we want to unshare them since the list of shared reports is a nightmare to scroll through and find the right report you are looking for.