Is it possible that you purchased seat reservations separately? I advise you to check the purchase confirmation e-mail for all documents received.
If you have any doubts, please call our SBB Contact Center: 0848 44 66 88 (CHF 0.08/min.) or
+41 51 225 78 56, if you call from abroad. We do not have access to information on train tickets here.
I wish you safe travels.