Books are sent out with the machines from the Warehouse. I would say that they depleted the supplies of the older edition within the week that you both purchased your machines and whoever purchased later received the new edition. No newer editions of the books were available to anyone until all stocks of the old edition were used (not even consultants could get the new ones) Think of it more as a bonus as some recipes were removed from the book and now between the two of you, you have them
....... Didn't want to post the replacement recipes for copyright reasons.