I recently bought tickets with seat reservations for Poland from https://bilet.intercity.pl/ https://bilet.intercity.pl/ I printed the ticket as I was in the o

I recently bought tickets with seat reservations for Poland from https://bilet.intercity.pl/ https://bilet.intercity.pl/ I printed the ticket as I was in the office. Some other passengers were showing phones, but I don't know if that was the same thing. (Remember when a flight is delayed, if the next one is full you simply don't travel. Standing or moving between seats can be preferable.)