I don’t remember what all we got with it, but I think genolution implants, the aurora implant, and some clothes? It’s not been used a whole lot, sure, but we did get stuff for it. I wonder if anyone has kept a list of all the things we’ve got. Besides it was a bonus among all the other bonus stuff in the CE, I wasn’t going to expect a whole lot from it to begin with.
But I remember someone at CCP saying that the problem with the mystery code was that they didn’t want it to help print easy ISK for those who have it with special limited items and ships and such. But besides saying that I don’t think I’ve heard much anything about it since 2015 or so.