Bascula8 months ago
Have you ever heard of BookCrossing? This is very similar to what you have done. You join, register your books (each one gets a unique BCID - BookCrossing ID), then leave them in random places. As strangers find them, they have the opportunity to use the BCID on the website to indicate that they have 'caught' the book. I've been doing this for almost 7 years and it's been a lot of fun (even if I only ever hear from about 10% of the books I leave).