To your dismay, you were unable to recreate the serum with the ingredients you gathered. You suspect that the ingredients have been contaminated with an unknown impurity.
What is the impurity?
| PUZZLE | ANSWER |
| Bento Lunchbox | - |
| Cardboard Package | - |
| Crate of Wood and Steel | - |
| Jigsaw Carton | - |
| Map Case | - |
| Music Box | - |
| Paper Container | - |
| Toy Toolbox | - |
| War Chest | - |