They are a special offer, bought in bulk by Gemeinde (municipalities) and sold on to residents. Not all Gemeinde (or commune in French-speaking Switzerland) does this, and there is a fixed number available per day
I see no reason why they could not be passed on, they are anonymous. You would have to know a resident of the Gemeinde (or commune in French-speaking Switzerland) who has to buy it ahead of time.
An alternative is the advance-purchase "Saver Day Pass", available to all: https://www.sbb.ch/en/travelcards-and-tickets/tickets-for-switzerland/1-day-travelpass/saver-day-pass.html