I got a brand new (at the time) baseball signed by legendary manager Bobby Cox, the pitching coach Leo Mazzone, Chipper Jones, Tom Glavine, and John Smoltz (before they were retired). I also have pictures of me with the payers while they were signing it, for authentication purposes.
This was back in 1999/2000 when I went to a "Breakfast with the Braves" event with my parents.
From a financial standpoint, you would have been better off getting each player to sign an individual ball on the sweet spot. I know why you didn't, so that's a moot point.
Here are values for individually signed balls:
Bobby Cox - $35
Chipper Jones - $45
Tom Glavine - $40
John Smoltz - $40
I can't find any figures for Leo Mazzone.
Your ball isn't going to be worth the total of those figures, because the pool of buyers that will want just those four is going to small. Your photos will help you sell it (if that's what you want to do), and add some value.
