Challenge: The Dead Letterbox

Difficulty: Beginner (1/5)
Social skills: None required
Motor skills: None required
Detective skills: Basic skills essential
Prize: No
Closes: 2 days after first correct entry

Q: Where is the envelope? (Hint: begin at the beginning… this challenge is all about your observation skills)

NB: This competition relied on the presence of the phrase:

Gur rairybcr vf oruvaq gur ybbfr oevpx!

on the challenges front page.