To, The Station House Officer, [Police Station Name], [City]
Date: [Date]
Subject: Report of a lost [item, e.g. wallet/mobile phone/documents]
Respected Sir/Madam,
I, [Your Name], resident of [address], wish to report that I lost my [item with details, e.g. black leather wallet containing my college ID, a debit card, and about ₹500] on [date], somewhere between [location A] and [location B], at around [time].
I have searched thoroughly and made enquiries, but the item has not been found. [If phone: The IMEI number of the phone is [IMEI].] I request you to kindly register my report in the general diary and provide me a copy of the entry, which I need for [purpose, e.g. applying for a duplicate ID / SIM replacement / insurance].
I shall be grateful for your assistance.
Yours faithfully, [Your Name] [Address] [Contact Number]