雅思口语P2 Describe something lost by others but found by you(ID Card)(文字版）

Well, a couple of weeks ago I found an ID card after the final examination on campus. You know, the ID card is rather necessary to all the candidates in college. The ID card is playing an important role in our personal life. Without the help of the ID card, we are not allowed to take trains or airplanes. In the meantime, we even couldn't use the facilities in library or such. The other day, I found one after taking part in my final exams, just on the way back to my dormitory. It belongs to a boy`s, he might be in the second year of university I can say. I even didn't know how he could get it lost, but I did a favor. I put it on the Internet of our campus. By doing so, I think that a lot of students in my university would notice that. I still remembered that in 4 hours, his owner came to my dormitory, certainly, I give it back to him. So, that is it.