They can take down one of them, the last one that he release , but that's it, other are gone already. Those pages they see five cages of a book are taken from another book.The book gives quotes from an alchemy bookpigeons already used.

Those The pages where he sent are taken from an alchemy book, this book references and transcribes pages of the retranscription of "Book of the Acts of Solomon, "This book is a missing biblical text !!! THE MOST VALUEABLE PAGES(e.g. mentioned in the bible but missing)So he sent the last remaining copies of some parts of this book using those carrier pigeons.