Is there any way to identify unused dashboards lens and apps using adoptions app.?

The section which shows unused assets is generated based on "Last Viewed." but when I confirmed with one user that he/her dashboard actually is viewed on a daily basis.

We have hundreds of reports saved in the system and i'm looking for a good way to manage those and delete the unused assets and inactive assets .

Can anyone help me out how to find unused assets that are not been used in last 30 days @Peter Lyons  @Midori Nakamura @Ed Mengel @Johan Yu  @GAYATRI SHARMA