Both boys enjoyed playing in the box. Jake (3) pretended he was a farmer and was using the corn to "feed" the animals. Joey (13 months) practiced pouring and dumping the corn and the acorns. It is great practice and a fun playing prompt for both boys. But I will warn you, it makes a MESS!
I have used the same Sensory Box materials for 3 years. I have 12 plastic shoe boxes that I use as storage. I have pulled the shoe boxes out and filled the Sensory Box each month for 3 years. Jake does not remember the box from year to year and still has fun with the material although it is fading slightly. When you are thinking of creating these boxes, 12 to use over and over for at least 3 years does not seem so bad!