We have heard that sometimes customers never receive their Google Places validation postcard from Google. This postcard is what you need in order for Google to validate that you are a legitimate business with an office that can receive mail.
However, whenever this postcard doesn’t make it to your office, here is another way to validate:
First, visit this Google Help article.
Next, in the top right corner click on “Fix Issue” > “Verification” > “I requested my postcard more than 14 days ago”
Lastly, follow the on-screen instructions to validate your business. This will include taking pictures of your office (inside and out) in order to prove that you are a real business.
Here is a short video: