A user who had been creating a page as "page a" realized that they wanted to replace "page b" with the content of "page a". The user decided to do this by deleting "page b" and then renaming it "page a". Following this, somehow the content of the original "page b" was restored by another user and it seems the content of the original "page a" is not available from the Confluence UI. Any tips on how I can track this down?