People in Japan tend to be pretty good about returning lost items. So, if you lose something, there’s a high chance you’ll get it back. Of course, that means if you yourself find a lost item, then it’s best to try and return it.
Recently, a Canadian friend of mine told me he found an 落とし物 (otoshimono, a thing that was dropped) in a cafe, a pair of Beats earbuds. He approached the staff with them, trying to explain that the 拾い物 (hiroimono, a thing that was found) may have been left behind by the person sitting next to him.
Japanese is primarily a language that deals with nouns. Instead of focusing on the verb, like in English — you dropped something, I found this — we wrap up similar sentiments by using terms such as 忘れ物 (wasuremono, a forgotten thing), 食べ物 (tabemono, a thing you eat/ food) or 飲み物 (nomimono, a thing you drink/ drinks).
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