Metal Box Where Schoolchildren Store Their Books
Puzzle 1 of Treasure Hunt Pack
Question is: Metal Box Where Schoolchildren Store Their Books
and the answer is: LOCKER
Word Meaning:
LOCKER — A type of storage compartment with a lock, usually used to store personal possessions for public use, such as in schools, railway stations, place of work, gyms, sports centers.
Definitions from Wiktionary.