The previous owner may not have fired the rifle with that scope on it. Quite a few folks will put the cheapest and most abused scope on a rifle purely for the hopes of upping the trade-in or sale value.
I'm really glad to hear things are coming along nicely for you and your new rifle.
If you didn't keep that target(s)- keep the next ones. It's not a bad thing to study them while you're thinking yourself through what you did and what you should do.
Can you post a pic when the Burris comes in and gets mounted?