List all Closed Web Parts on a Page

Closed web part gettin' you down?

Append "?ToolPaneView=2" to your page URL to force "Edit Page".

Append "?ToolPaneView=3" to your page URL to force "Search Web-Part Zone".

Append "?DisplayMode=Design" to your page URL to force "Design Bar".

Append "?ControlMode=Edit" to your page URL to force "Web Part Zone Edit".

Last and most favorite: Append "?contents=1" to your page URL to force "Web Parts Maintenance". Remove the offending web parts and increase the load times of your page(s). This allows you to manage those closed web parts that should have been deleted.