why not just add a checkbox to your invoices - then do a CSV upload to mark the checkbox as "yes" and then use that as your search criteria?

I am not sure if you are answering my question. In this case, I need a saved search. Thank you!

Right, and I'm saying that if you had just "forced" NS to have a custom field that you could use instead of the Doc IDs you'd be done with this task by now