Two things:
Use this form for CSE and you don't need to deal with VO details:
https://secure.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx
Write following email to the email id below to know your VO. The reply will be very quick !
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Email id:
cpc-ctd-Ottawa@cic.gc.ca
Subject :
Visa Office - Enquiry E000xxxxxxx
Dear Sir/Madam,
I would like to know the Visa office where my Express Entry application (E000xxxxxx) is being processed?
My credentials are:
Express entry profile number: E000xxxxx
Date of Birth:
Last Name Principal Applicant:
First Name Principal Applicant:
Federal Skilled Worker Program
Thank you.
Regards "
Good Luck!