Does anyone knows how you can tell when Casio had manufactured the PX780 based on their Serial Number. I just purchased a PX780 and on the Box and underneath the Keyboard there is date but it Indicates CARB 06/05/2013, is this the date of keyboard being manufactured or is the date they passed the test for CARB. My purchase date is 06/13/2016. I just want to make sure I did not receive a keyboard that was sitting in warehouse for three years and does not have all the latest fixes. thanks, in advance.