Bought a DDJ 400 at guitar center it was an open box purchase. The RB LIC key was missing? What should I do? Please reply.

They should have actually contacted us through their retail channel to obtain a replacement, but as they hadn't, please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue. To speed things up, please attach a photo of the serial number from the back of the unit and a copy of your purchase receipt. Thanks.