http://sbb-etickets.ch/en sagt

Where do I find the MobileTicket I've purchased?

Purchased MobileTickets are stored under "Tickets" – "Show Tickets". If the MobileTicket you have purchased no longer appears, you can view it again under "Show Tickets" – "Please update".

When the app is open, just give your Smartphone a little shake and the last ticket you purchased will appear immediately.

dann soll im Billett / Boarding Pass oben rechts ein blauer Link "Hinzufügen" sein, der zur Wallet führt.