We'll create fresh WordPress site with Cleanscript – Page Templates Info installed. You have 20 minutes to test the plugin after that site we'll be deleted.
A very simple plugin that provides information about the Custom Page Templates available in the theme: What they are, which are not used and where the used ones are used, selectively.
Main features:
Available page templates list
Unused page templates list
List of page templates with checkboxes that output when submitted the links where they are used