Does the plaintiff have an obligation to help the judge find the defendant?

You are not obliged to find the defendant, but you can provide relevant information about the defendant. The judge just wants to buy time. The worst thing you have to do is to wait a few more months. If it can't be delivered normally according to the relevant laws and regulations, you have to make an announcement. After 60 days, it will be deemed as delivered, and then the trial will be held.