I did not take two books because I was in party and they were taken by a friend and not by me.
The books are: "Daggerfall Market Shopping List"
"Verrik's Note"
I didn't know, 2 years ago, that these books were been unavailable after the quest.
Both Lorebooks disappear once a player or group member interacts with it.
Now, I'm missing them both.
People choosing to play the game differently to you are not wrong, bad, stupid or playing too much, or too little. They are just playing it differently to you, they don't need you to "correct" them. No one is playing the game wrong unless they are cheating or hurting others.