These mystery "reference no. XXXXXXXXXX" show up in a hidden area of each page, I don't know if they mean anything. To uncover these secret numbers, highligth to the right of the ameneties with your mouse and as you highlight, you will uncover these numbers. I have no clue if there is somehow a master list we can uncover??? Maybe the reference number is the same each time, and by using the reference number we may be able to get the hotel name??? If anyone books a hotel, post the reference number and lets see if this works!!! Just a thought.....