Biting the bullet

I'll have to meet that unpleasant mr. Boulette again. He has been sending me messages, alternating between kind and angry. Sometimes he talks about offers of money and prospects of gold mountains. The next mail he'll be uttering death threats. Ultimately, he wants to complete his collection of the cogwheel artefacts and he knows I have made progress there.

I have not made progress is in understanding the meaning of these artefacts. My first intuition is that it is a kind of starmap, but I haven't found anything in the archives of old charts. Perhaps it plots a course through Anoikis? Did the Takmahl understand enough of Talocan technology to build a wormhole?

Here's where Boulette comes in. He claims the pieces are part of a larger machinery - one that unlocks a vault to the gold bullion of the Takmahl empire at its end. I need to find out how he came to this conclusion.