If Robby.jp has an eBay or YahooJapan ID, it's pretty well hidden.
I still think it was just a factory boo-boo. Robby.jp is just a wholesaler, I don't think they deal with the general public directly for the most part. Unless it was an employee being naughty, I just don't think it was them that swiped the chase box.
I mean, if you're swiping chases, why not take the JarJar box too? Between all of us here, I think we've easily seen 25-30MC from Robby over the years and I don't remember this being an issue with Robby before. Why would they just start now?
Of course, if we see more MCs from Robby.jp showing up without chases, then that changes things... but for now I'm not going to convict Robby.jp on one bad MC.