Just wanted to post this in case anyone has come across this difference. By the way, the 4th line arrived today. Here's my timeline:
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We received your application for Canadian citizenship (grant of citizenship) on February 19, 2015.
We sent you a letter acknowledging receipt of your application(s) on March 13, 2015. Please consider delays in mail delivery before contacting us.
We started processing your application on May 7, 2015.
Your file was transferred to the Citizenship Guy-Favreau office on June 2, 2015. The Citizenship Guy-Favreau office will contact you.
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Notice that the 4th line specifies the office rather than just 'Montreal Office'. Anyone can explain this difference? Thanks all...