How to claim&merge an unofficial Facebook page in 5 steps
When visitors check in on Facebook, but did not find your Facebook page yet, an unofficial page will be automatically generated. This first visitor creates a new (duplicate) Facebook page and is therefore labelled as "unofficial page".
22 Jan 2016 ... You can claim this page and merge it with your official business page. It is important that you own all the social media pages that guests can use.