If the university has gone through the formalities of dropping out of school, you should be able to bring it up yourself. If the case is not filed in those years, there are two situations. First, if you are still at school, you can go to the school to get it (it is very likely that the file is at school, because it is very unlikely to be sent back, and it is difficult for the school to find out where to send it). If you can't find it, it should be lost, so you can only ask the school to issue a certificate of file loss. I hope it helps you.