In skyrim, Oghama Infinium is trapped in a Dwemer lockbox. Herma-Mora has been manipulating Septimus Signus for many years to open the lockbox to free the book.

However, the book was last seen in the Oblivion Crisis, way past the time where all Dwemer has died. How was it locked in a Dwemer lockbox then?

Furthermore, the book is an artifact of Herma-Mora, and these artifacts can simply be recalled to the respective realm of Oblivion and given out again. He has certainly done it before.

• Mora promised the Oghma Infinium as a reward for defeating Graccus. However, the Prince [...] snatched it away upon Graccus' death

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Why did Herma-Mora need to manipulate Septimus for many years to open the lockbox?

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2 Answers

Possibly the Hero of Kvatch/Champion of Cyrodiil could have done it. Septimus was manipulated most likely for a bit of entertainment by Hermaeus Mora, because he had/has the knowledge that the Dragonborn would open it, as he is the Daedric Prince of Forbidden Knowledge and (I think) Prophecy. The Dwemer were extremely advanced, and could have possibly made such a strong lockbox, defendant against magicka, and mortal weapons, even Daedric Artifices, that Hermaeus Mora couldn't have transported the Oghma Infinium away, and Kagrenac's Tools still work (As stated by Memor-X), leaving the possibility that it was locked in by the Hero of Kvatch much larger.

I would think that the dwemer used a technology so advanced that even the dark prince of knowledge could not brake the seal to get his precious book back. So he just tosses the job on a poor old man and doesn't even tell him the truth about what is in the box.