Canada Post on strike- Fedex and Purlator don't accept P.O.Box- what to do?

[TGR]

Hi all,
so I was all ready to post my package to Mississauga CPC today, spent hours yesterday double and triple checking everything and when I got to the post office at 8am this morning, I was told Canada Post is on a full strike and they would not be processing any mail. So I went to a Purlator office who then told me they don't deliver to a P.O. Box (and most or all other courier services are the same I think). What is the street address for the Case processing centre in Mississauga? I am submitting a family class application to sponsor my spouse.

[MDSB]

this is the courier address:

2 Robert Speck Parkway,
Suite 1200
Mississauga, ON
L4Z 1H8

[TGR]

Thanks MDSB