Dynamics CRM online fetchxml Report deployment for embedded connection/connection string

Hi Dynamics CRM professionals:

I have a question about fetchxml report connection string when report is published or deployed. Here is the scenario:

1. I developed CRM reports using Visual Studio 2012. In order to test them, I used a test CRM online trial because our reports are fetchxml based. So, the connection string for the reports contains CRM online trial URL, which has expired.
2. The reports were published to our dev CRM, and managed solution was created containing the reports. The test CRM online connection string was not removed from the reports.
3. After managed solution was pushed to our test CRM and tested successfully, it was installed into our client production CRM.
4. Now, client found out the existence of the test CRM online trial connection string in our reports, and had a concern that the reports connect to the test CRM online trial, which is an offsite data source (outside of client firewall). It would consume their network resource.

Some people say that the test CRM connection string will not be used and will be overridden when reports are run on client production CRM. We really need an official explanation or clarification or confirmation.

Thanks in advance

Larry