You can take that Social Security number and see if the previous owner is dead or not by searching the internet. I had a pistol once the was given to me by my mother and it had a SS number on it so I checked it out-it was my deceased mother's SS#.
Were you surprised by this? It would be like sending off your DNA and having it come back saying you’re exactly what you thought you were. What if the SS# came back as some guy across town that you’ve never heard of and through some research you found out he was your real father.