Check the UPS flights that have left over the last couple of days (FlightAware keeps a 40-day history of them for non-premium members). Check to see if any of them have diverted or returned to ICN/RKSI. Also, the timeline in your status is out of order so it makes it confusing. If put in order, it looks like your Mac would have left PANC and went BACK to RKSI, and that doesn't seem right at all, unless an entire pallet had the same thing happen.
Definitely check the history of flights from RKSI-PANC, RJAA-PANC, ZPSD-RKSI, and ZPSD-PANC, and call UPS in the morning. Apple won't help you much here, because they've handed the chain of custody over to UPS.
BL.