How do I find out which references is no longer available?

If I remove an item in Zotero, and then refresh my Word document, the plug-in kindly notifies me of the fact, and offers me to remove the reference. Is there a way for me to find out which of the references was in not in the Zotero database.

I'm using 1.0.9; and I am asking this because I'm considering to manually removing duplicate entries. I'm just a bit afraid of breaking existing draft articles... Should I just hang on until Zotero eventually assists me in removing/merging duplicates?
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