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FairyLoot posted an aesthetic montage on their IG account on 11 April 2023 for the June 2023 Adult pick…here is the book I think it is!
So far, if the selection is Shanghai Immortal, this will be in the FairyLoot June 2023 Adult box.
Just in case the FL edition is not signed Forbidden Planet is selling a signed edition for only £13.99 (as of this posting) here. Chao is also conducting a preorder campaign (many times, Book Box books are not included) here, though the author will generously count library preorders toward this compaign.
As I notice additional editions, I will add them accordingly.
Obiligatory disclaimer: I am not sponsored or affiliated with any of these boxes, books, or authors. Additionally, a mention on my page does not mean I endorse the boxes, books, or authors. I am simply providing information.