I plan to introduce this to S later this afternoon. I will model for him opening each "container" and taking the dino out. We will also reverse the process and close the dino inside. This should reinforce "open/closed" and "in/out" and it's good fine motor practice. I would prefer to use small sports or Halloween objects since we are talking about those two topics this month, but dinos was all I had on hand.
Thanks for the idea, The Wonder Years!