Quick hypothetical: You’re at the library, and you pull a copy of The Tipping Point by Malcolm Gladwell from the shelf. Before bringing it to the front desk to check out, you flip through the pages, and an envelope falls out. You pick it up, and it’s stamped and sealed and addressed to a P.O. Box one town over. What would you do with it?

Followup: Would your answer change if it came out of:

  • ... a volume of Encyclopedia Britannica?
  • ... Harry Potter and the Prisoner of Azkhaban by J. K. Rowling?
  • ... The Infernal Machine: A History of Terrorism by Matthew Carr?
  • ... a book on the new releases shelf?
  • ... a magazine?

If no to all of the above, is there any case where your answer would be different?