FYI You're actually more at risk than CandyJapan if you're shipping physical goods based on successful Auth and/or offer a low pricepoint item. Even without catching the uptick in orders, CandyJapan likely would be able to see some chargebacks or fraud advice before the bulk ship date (2x a month I believe).
One thing i've learned in my short time in the industry, fraudsters are great at finding weak merchants for card testing and triangulation schemes. What was 4 days worth of work for this fraudster, cost CJ thousands in fees, multiple days. How many late nights have been devoted to cleanups like this?
Also, a lot of payment processors are offering complex fraud solutions (ipGeo, proxyPiercing, device fingerprinting, etc) for pennies per Auth. definitely worth asking your processor and your processor's processor for more info. Beats being the lowest common denominator.