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:

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.