Apple only made products themselves in the following factories:
- Cork, Ireland
- Singapore
- Fremont, CA
- Elk Grove, CA
- Colorado
Anything made in another location is an outsourced product. Apple has never had a Mexican factory. Most, if not all keyboard production was and is outsourced.
Each factory was likely given considerable leeway in how to manufacture the cheaper Apple keyboards (Keyboard II and Design Keyboard). Cost was probably a significant factor. Apple may have specified the appearance and electrical interface, but everything else was left up to the manufacturer.
