在生活中，我们难免会遇到一些小意外，比如不小心遗失了物品。当这种情况发生时，写一封失物招领信是一个很好的解决办法。通过这封信，我们可以清晰地描述丢失的物品以及联系方式，以便失主能够顺利找回自己的财物。以下是一篇关于失物招领的英语范文，供参考。

Found: A Black Backpack

Dear Sir/Madam,

I am writing to inform you that I have found a black backpack in the school library on November 15, 2023. It was left near the reading area. The backpack contains several books and what appears to be a set of keys.

If this is your lost item, please contact me as soon as possible. You can reach me at my phone number: 123-456-7890 or email me at example@example.com.

Please bring some form of identification when you come to collect your backpack. This will help us ensure that the backpack is returned to its rightful owner.

Thank you for your attention and cooperation.

Sincerely,

[Your Name]

[Your Contact Information]

以上范文简洁明了，包含了必要的信息如发现地点、时间、物品描述以及联系方式。同时，也提到了需要提供身份证明以确认失主的身份。这样的细节处理有助于避免不必要的误会，也是对双方负责的表现。

希望这篇范文能帮助到那些需要撰写失物招领信的人士。在实际使用中，请根据具体情况调整内容和格式。