Thanks for your honesty about the extra book(s) you received! You're scrupulous beyond measure.
We would appreciate any information that you can give us regarding the extra books that you received, so that we can work with the customer that should have received them.
If you could submit a ticket with a SKU number from one of the extra books you received we can find who the books belong to. A SKU is the sticker on the spine or back cover of the book, and it should have 2 letters, 3 numbers, and 3 more numbers.
We really appreciate your time and help in clearing up this little literary debacle.