Unselected items from list

I am writing a short cut that provides me with a list of tasks I said I would do yesterday. I select the ones I did not do and then I want it to give me a list of the ones I did not select so I can choose to do them today or not if they are no longer important.

Any ideas on how I go about getting the unselected items?



Here is a simple example of one method that takes advantage of Toolbox Pro.