It looks different Visa offices function in a different way.faith-full said:per the website,
Approved Applicants for Permanent Residence
Submissions of passports are only accepted by mail. Passports are returned by mail within 30 business days. This does not include mailing time.
http://www.canadainternational.gc.ca/new_york/imm/general_info-rens_generaux.aspx?lang=eng&menu_id=206&menu=L
you can also track the return package.