I spoke to IRCC and they said my file says secondary office is Calgary but it's currently still in whitehorse! no GCMS notes received yet! so anyone else without GCMS can ask IRCC about secondary office (if interested to know).The only way I am aware of you finding out where your file is at is through ordering your GCMS notes. So you may see a note saying your primary office is Whitehorse and perhaps a notation that your secondary office is Calgary (for example). BUT KNOWING THAT WON'T DO ANYTHING TO SPEED UP YOUR FILE. Best wishes.