Google seems to have a backlog in the number of business verifications they have to manage within Google Maps / Local / Places.
A Google Business Help thread has one business owner complaining he submitted his code into Google Places 3 weeks ago but the business listing is still not verified.
Google Places representative Jade Wang said Google is delayed more than normal. She said:
We were experiencing longer delays than usual at the end of 2012 and this page may have been affected.
So if you submit your code to Google, that is if you even get a code, then you may have to wait a while right now.
Forum discussion at Google Business Help.