Someone took every book out of from my ( our) Little Free Library at one time. I was heartbroken. Thinking the books were sold for money, I decied to get a stamp. I stamp each book , on the inside cover and back inside cover. Guess what? No more books taken all at once. I highly recommend stewards to invest in one and keep the purpose, the purpose of setting up Little Free Libraries. People have actually donated books from other Little Free Libraries with their own stamps. That's pretty cool to see. Sincerely, steward J Sellars