They didn't turn up for me as well. But, the reason is they are not designed for the ereaders.
If you look in the bottom right of the pages for the books, there is a section called "Read This On". It lists the Kobo devices and applications the books can be read on. The e-ink devices are not listed. I had seen that section before, but I had never paid any attention to it. As the books are both graphic novels, I can see why they don't think they are suitable for e-ink devices, but they should go to the desktop app.
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