I think we are talking about two separate books. The one about the archeological expedition that was going for 350 used on eBay, now reissued for 189 on Amazon is by the OP and is strictly an academic work. The OP is friends with the millionaire who buried the treasure. That millionaire wrote a separate book about the treasure with clues that is called The Thrill of the Chase and is available on Amazon for 60. Think of it as a coffee table mystery book that might have a real prize.