On my first tribe I didn't finish the tablets collection and as I don't spend many time on it, I think it will stay like that!!

But for the others, I start the "rubble" as soon as I can at the early beginning of the game. I start it until there is scaffolding on it and I stop it to do other tasks.
The advantages are that I may find tablets early at the beginning and so I have more chance to finish the collection, and I keep a task to train some builders! The disadvantage is that when my builders are doing something else, they let it time to time and go to the rubble

But it's not really disturbing!
And so, my 2nd tribe has all the collections finished! but it took more than weeks)
...
... I've been playing this one game for over two weeks and that feather never shows up. Very frustrating.
The feathers may be everywhere in the village and they merge in the foliages, the soil of the orchard, behind the trees, etc!

Good luck!
