why did the why did the author decide to return the letter

Dear Student,
The author found a tin box kept inside the secret drawer. His curiosity forced him to open the box. The letter was written by a brave, kind, open-hearted captain of the English troop Jim Macpherson. The letter was kept in an envelope where an address of his wife was mentioned. The author decided to send the letter to his wife Connie Macpherson.

Hope this helps.

Regards