Final answer:
Option (f) is the least likely material to be stored in a utility box due to its extremely low probability.
Step-by-step explanation:
The material least likely to be stored in a utility box is option (f), which has a probability close to zero. This is because the probability of all 25 objects not using the foil is extremely low. The other options, (a) to (e), have higher probabilities of being stored in the utility box.