"Their" is correct, because it shows possession of the desk by someone else.
It would be in passive voice. For active voice, it would be something along the lines of, "The FBI opened the email."
<span>1)the prevailing feeling or emotion of a literary work; also called “atmosphere”
</span>A-Mood
<span>The mood of a story describes its general vibe
2)descriptive language that relies on sensory details to help readers imagine the setting, characters, and details of a story or a poem
</span>D-Imagery
<span>
3)the time, the place, and the social and historical conditions in which a literary work occurs </span>
E-Setting
<span>The setting includes the where and when of a story
4)a classification of literature characterized by particular content and form
</span>C-Genre
<span>Genres include comedy, romance, and science-fiction
5)the primary character in a literary work, often considered the hero or the moral character </span>
F-Protagonist
The protagonist is the main character of the story, and generally the one you're supposed to sympathize with.
6)a character whose perspective of reality is biased and/or distorted
B-unreliable narrator
You don't know if you can believe everything an unreliable narrator says, due to the established idea that he is dishonest, biased, or not totally sane
