As a librarian, Repaire, perhaps you are familiar with lists of books most commonly stolen? I believe some are popular because they are assigned reading in schools.

Harper Lee's To Kill a Mockingbird
Sharon Flake's The Skin I'm In
Meg Cabot's The Princess Diaries
Caroline Cooney's The Face on the Milk Carton
Philip Pullman's The Golden Compass
Michael Brooke's Concrete Wave: The History of Skateboarding
Jack Canfield's Chicken Soup for the Teenage Soul
Thia Luby's Yoga for Teens
Stephen King's The Green Mile
J. R. R. Tolkien's The Hobbit
John Steinbeck's Of Mice and Men
Orson Scott Card's Ender's Game
Phyllis Reynolds Naylor's Shiloh
Louis Sachar's Holes
Gary Paulsen's Hatchet
Lois Lowry's Number the Stars
J. K. Rowling's "Harry Potter" series
S. E. Hinton's The Outsiders
Avi's Something Upstair
Sharon Draper's Tears of a Tiger
Carl Deuker's On the Devil's Court
Lurlene McDaniel's Dawn Rochelle
David Pelzer's A Child Called "It,"
Megan McCafferty's Sloppy Firsts
Jerry B. Jenkins and Tim LaHaye's "Left Behind" series
Lois Lowry's The Giver
Jacques's "Redwall" series
Wilson Rawls's Where the Red Fern Grows
Christopher Paul Curtis's The Watsons Go to Birmingham, 1963

Sincerely,

Gargoyle