The correct answer is "his little tool boxes as well- they were treasures!"
Step-by-step explanation:
An opinion and a fact are different because opinions express personal perceptions about the world. Due to this, opinions might include words such as amazing, boring, incredible, etc. that express personal perceptions. On the other hand, facts describe reality including real events, people, places, etc.
In the excerpt presented, one of the statements that is an opinion is "his little tool boxes as well- they were treasures!" because the idea the narrator considers the tool boxes and equipment as treasures is a personal perception rather than a global general fact. This is also showed through the use of the word "treasures" that is subjective.