17057294 appear on very late LX's and earlier HZ's so i'd say this is it. The very first few A9X's appear to have the HX's 17056280. The earliest 17057294 I've seen is 1787 which is I think June 27th which would be spot on for early HZ. A November HZ might be a bit later. I have recorded a 2217 which is August 9 and a 2367 which is August 24, but there will be others.