From many previous posts and ON PAGE 1, the four parts to be found for goal 9 are:
Scrapbook Chapter 3: Dearest Diary
* Find the diary binding 0/1 GO (skip 34 gems) | horses
* Find the diary quill 0/1 GO (skip 2 gems) | complete any craft in the workshop
* Find the diary lock 0/1 GO (skip 12 gems) | hatchery
* Find the diary key 0/1 GO (skip 8 gems) | defeat a skunkupine
Rewards: 100 coin, 10 xp
Some players hatcheries are not dropping the lock, expect this to be fixed sometime today. While waiting for this, you can collect items for all 3 diary chapters. Many are needed.