There isn't any indication here one way or the other, but some the unique IDs of some devices (Microchip unique MAC chips) are documented as being programmed as

There isn't any indication here one way or the other, but some the unique IDs of some devices (Microchip unique MAC chips) are documented as being programmed as a wafer, before being diced (as justification for them not being in serial order on a reel, that they may be shuffled from wafer to packaging).