Golden Oaks is a board intended to be a sort of library of mlpol. A location to display our most important threads. It was created in the time before there was any sort of archive. It is locked to all posters except admins (maybe moderators can post there, I don't know). If a thread is selected to go to Golden Oaks, an admin may move the thread to that board. Recently, this power was extended to Moderators as well. It is somewhat buggy, and has in the past resulted in only the OP being transferred, or multiple copies of the OP, or a partial transfer. To move a thread, a staff member asks in staff chat if it should be moved, and if there is no opposition, a person with the power to move the thread moves it. Because of what basically amounts to forgetfulness, besides the fact that the ability to move has historically been limited to admins, and probably also historically error prone transfers, it has not been used much.
The threads are organized by the creation date of the OP on its original board, though of course sticky threads are on top.
The threads you named were not been transferred probably for two reasons. The more minor reason is that no one thought to move them. The greater reason is that while these threads represent important events in mlpol history, they are embarrassing. They relate to events no one on staff would like to remember. We have generally intended Gokden Oaks to display higher points in mlpol history, like OC creation and the 4chan cup.
Golden Oaks was created long before the featured thread archive