Bringing gifts from us to Austria

Not unless Cabbage Patch Doll wants a seat of her own and the train is full :-)
(Sorry, couldn't resist that).

This is a gift, and well within your customs limit for entering Switzerland and for entering the EU (crossing Swiss-Austrian border).
At Zürich just walk through the nothing to declare channel. They aren't interested in tourists and normal travellers, just people trying to smuggle in to avoid customs duty and sell.
When the train crosses the border, customs will get on at Buchs (last stop in Switzerland) and walk along the train eyeing everybody. But they rarely ask anybody anything, and if you are looking out the window you may miss them.

Thanks for your reply and humor. :)