The Treasure Trail collection log book is a tool to help keep track of clue scroll rewards. It also tracks rewards received from the Giant Oyster. It can be found in the stack behind Zaida.
It can be worn in the pocket slot as with other log books. When read, it shows a log of your clue scroll rewards. The tracking for the items on this log started on 2 October 2017. The tracking of number of clues completed has been in-game since they were released as quick chat messages.
Other right-click options include the Treasure trail stats list that is also kept on the Treasure trails notice board and a link to the hidey hole list table.