When you return something that your child brought home by accident
In this case, you want to return someone else’s belongings that your child brought home by accident. You don’t have to find the actual owner: the schoolteacher will sort it out. If the item is clothing such as underwear, a handkerchief or a swimsuit, most parents will wash it before returning it.
Model
Conversational flow and useful expressions
Greeting
Regarding the item in question
Request
Closing
Parent's name
Supplement
The phrase 「持ち主に返していただけませんか」(mochinushi ni kaeshite itadakemasen ka), meaning "could you return (something) to its rightful owner", is used when you don’t know the owner of an item.