I was helping a user on the GMB forum and found it’s getting even harder to find duplicates now with MapMaker not having a phone-number search option any more.
Currently, I search on Google for “plus.google.com” “999-999-9999” and then add &filter=0 to the end of the URL to find a list of duplicates.
However, now when you click on them, they all look the same and don’t really indicate if the page is connected to maps or not. Previously we’d look for features like a posts tab or review options to know what kind of page it was.
The way to tell if the page is verified or not is to get rid of the /about in the URL. Usually the URL you are looking at is something like this: https://plus.google.com/114760363041730005343/about which now shows you limited information. Now if you remove /about you will see a different view (https://plus.google.com/114760363041730005343)
Since the only duplicates that matter for ranking are those that are connected to Maps, this how you can tell which pages you should be concerned about.