Hello MacDee
Thank you for your question.
Since you did not buy the tickets with the SBB, I cannot answer this question. Usually on the tickets it is noted when exactly they are valid (for example one whole day, or only for one specific connection etc.)
In doubt, please purchase new tickets for the actual day/connection you need, so that you are sure to be on the go with valid tickets.
As soon as HappyRail is available, you can check with them what to do about the other tickets.
Thanks and have a nice weekend!
EleonoraS