Blanc list of uniquely secured items

I have an issue in a 2010 Document Center

When I go to site permissions, I am warned that "Some content on this site has unique permissions which are not controlled from this page.

I then click "Show me uniquely secured content".

I am now presented an overview of "Lists that may contain items with unique permissions".

I then click "view exeptions" to see the items.

But in the list that shows up, there are no items, only a note "There are no items in this list that are uniquely secured."

How can I get to see the items that still triggers the warning about unique permissions?