How to find out if someone is trying to serve me papers?

Ok so if he was a process server, who was serving a summons and complaint, then that means the lawsuit has already been filed. So, you can call all the civil courts in your county, including small claims court, and family courts and ask the court clerk to do a name search-for your first and last name in the last 3-4 months to see if anyone filed a claim against you. The other possibility is that this could be a census taker, but those people usually announce themselves if you ask them what they want. Another possibility is that it was just a sales call.