Reward for Completing Collection - Decorative Easter Eggs

One of my sims families completed the decorative Easter Egg collection today. They already had seven of the ten eggs, so -- for the first time ever -- I used the bb.showhiddenobjects cheat to buy the remaining three eggs. Once the collection was complete, a notification came up that "a certain furry mammal" was giving the family a reward for completing the collection. I looked in the family inventory but didn't find anything new. I checked the inventory of the sim I was playing and found nothing new there.

Is this because I used the cheat to finish the collection? What was this reward supposed to be? Where was I supposed to find it?