@Riocaz
We do not know how many units they may have had from an earlier shipment. Possibly the same shipment that Henrycat received his unit from. Maybe they only had say 300 units initially sent. The new batch is then the one that arrived the other day, and had not been cleared by customs. I aggree that UPS would not have to get the unit from Irex, they would pick them up directly from the customs house (They even act as a customs house themselves). The lack of chronology in the order numbers could still be something UPS had to do with. They would typically group orders by destination instead of by order number in order to opimize their handling of the shipments.
This is just a theory to stop me from going insane