Nice to see you again
To answer your question:
No, there is not one official Book of Shadows. A BOS (as we usually refer to it) can be something a practitioner starts when s/he first begins to practice and then adds to it as s/he learns.
Often it is a blank notebook where correspondences, rituals, spells, etc are written down.
Or, sometimes, a coven or group will have a BOS that they will pass to initiates.
If you do a Google search for "Book of Shadows" you will find many examples