The booklet is actually a 6 page document covering what Astell&Kern is and the current lineup including the AK100ii, AK120ii and the AK240 with full specs. Based on what I have been able to find via google is what I got appears to be a special "gift package" including the AK240 and the Crystal Cable, that was prepared exclusively for ParagonAribia, which is a high end retailer/service provider in Saudia Aribia.
I can only assume someone received this gift and had no idea what it was, or had no interest, and sold it off to a Los Angeles-based electronics company that sells computers and other electronics on eBay. Given there is no doubt the AK240 is real, as I auditioned one in my home for a week just a week ago, then the Crystal Cable has to be real as well. Why would someone package a real AK240 with a fake Crystal Cable?