Final answer:
In response to a friend losing their lunchbox, expressing sympathy and offering assistance to find it or share lunch can foster empathy and friendship. If not found, reporting this to a teacher or a lost property area would be an useful step.
Step-by-step explanation:
In this situation, I would first offer my sympathy to my friend for losing his lunchbox. Then I would help him look for the missing lunchbox. We would retrace his steps to see if we could find it. If we could not locate the lunchbox, I would share my lunch if I had enough, or help him report the lost item to a teacher or lost property area if there is one. The reason for this is that it's important to show empathy towards friends and be there to help them when they are in trouble.
Learn more about Helping a Friend