I guess there are several possibilities. One is still in Shandong. Call the personnel department of the unit and be polite. One may fall on the talent market in Shandong, which is easier to handle. Just go directly to the talent market over there and get it back. If the first two situations are not true, go to the graduation school and ask. Or if you still have proof of school account migration, it will be easier. Go to the local police station to ask questions first, and they will tell you what procedures you need. In China, hukou is still very important now, so solve the baby's problem as soon as possible. As a reminder, you usually don't go to work on Saturday and Sunday, so even if you take time off, you should take time off first.