smartlist

I am using the latest version of Itunes and I want find all the missing tracks. I have been looking online for the procedure and found "Scans all tracks of the Library for those files that iTunes can find and adds them to a playlist called Found.It this is a script I ran , and I have created a list of all found files
Use in conjunction with a smart playlist called Lost consisting of the rule Playlist is not Found, to identify missing files within the library."

I ran the script that created a "found folder" but am not able to figure out how to make a playlist for the lost files using a smartlist.

Thanks

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