Swiss Transfer Ticket

We are 6 adults who will be travelling in Germany and ending up in Basel at the SBB station.
We would like to buy our Swiss Transfer Tickets at that time
May we buy the Swiss Transfer Tickets at the SBB or is it necessary to go out to Basel Airport

(Our intention is to take the train and bus directly from Basel to St Luc and 5 days later, take the train directly from St Luc to Geneva airport)

Thank you for your help

You can buy the Swiss Transfer in the Basel Hbf. Most major stations sell the Swiss Passes
Dick

Most swiss rail passes can indeed be purchased on any larger Swiss station. However, the Swiss Transfer Ticket is an exception. I would not know where to purchase it locally. To the best of my knowledge, it is only for sale online and through specialized travel agencies abroad.