What changed with the Mystery Box Upgrade and Easter 2015 updates?

Wow, the new mystery box sounds promising. I am happy for most people, those are good prizes to have a chance to win. However, I already own Blue Haired Lawyer, and actually have 2 lard lards in my town already. I am not trying to make room for a third. I hope there is a different replacement prize available. For the first of the new mystery boxes I opened, I received an Itchy and Scratchy Billboard. I already have one of these as well, but not in Krustyland, so I was much happier to receive that than another Lard Lad.