You can probably get the judge to allow this under the right circumstances. Unless you are in small claims court, you will need a lawyer to help you file the right motion.
This is not legal advice. You should always discuss the specifics of your issue in person with an attorney. Be aware that there are time limits on all claims that depend on the kind of claim, so do not delay in seeking an attorney.
You don't need a 106(b), you need a process server
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The judge may approve it, but you're probably better off trying to find them first.
There are lots of ways to find people. One of the easiest is a Freedom of Information Act letter to the Post Office requesting the physical address of a box holder for service of citation. However, if this is a case in District Court, you'll need an attorney to help you, and it's better to arrange that sooner rather than later.
Perhaps, but you will have to establish by affidavit or other competent evidence that the post office box you specify is, in fact, the defendant's and that service by mail at that address will be reasonably effective to give the him notice of the suit, pursuant to the provisions of Rule 106(b)(2).
If you don't have a lawyer, you should get one. This is only one of dozens of questions that will arise as you go forward. You cannot learn to practice law or how to prosecute a lawsuit on the internet.