Hi there-
I think if I were you, I'd try to get along to this place

Adresse und Telefon (identisch mit Clublokal):
Sekretariat SAC-UTO
Stampfenbachstrasse 57
8006 Zürich
044 362 96 70
sekretariat(ät)sac-uto.ch

on a Wednesday between 12.30 -18.30. They re-opened on 6th January. For finding the place you'll perhaps need more help than their plan! Type
'Stampfenbachstrasse 57 8006 Zürich' into this map - might be easier.

If you cannot manage to get there because of working hours, try writing an e-mail to them. The worst thing they can do is ignore it. You'll probably find someone who can help you further.

Hope you find what you need.