I received an email today from Google Places with a notice to cleanup duplicates. See attached
Baffled as can be I called Places support and they said there's an overwhelming amount of duplicates in their system. I explained that I didn't see any on the public end.
The agent explained that Google will archive and block these duplicates from any public system and calling-in will be the only solution to have these dupes cleared up.
She also explained that the email was sent out from a new email system that will notify owners of any guideline violations.