Hello, I found a staff Oyster card on the floor, it didn’t have a picture or anything so I gave it to my boyfriend to try yesterday morning. He used it once, on his way back home there was officers at the train station. They told him he had to be detained, although later they let him go as the police car was full. They said to expect a letter in the post to attend court. He has paid for every journey, it was literally one journey for him. It was my fault to give it to him, what can I do about this? Any advice would be appreciated