What if you LOSE your ticket? (Train Sim World)

While this person was waiting at Ashford International, he found a different train type on the opposite platform. He decided to step inside and have a quick look before it left, as he was waiting outside on the platform anyway. He sat at a bay of 6 and put his phone and ticket on the table to demonstrate that it can be useful. But when he went to get up and leave the train, he took his phone but left the ticket. Would anything happen? Would a ticket inspector catch him? Would be get fined? Would he notice his ticket is gone? Southeastern Highspeed DLC was used for this route, as well as class 700 loco DLC. I do not own Medway however I do really want it