I heard a story about a business that worked with a Chinese chip manufacturer once. They ordered 10,000 of a particular microprocessor and instructed the company that they would accept a maximum of 1 faulty chip in 250.

When the order arrived there were 10,000 chips, and an extra little bag with 40 more chips in it. The packing note said that they'd sent the faulty ones separately but weren't sure why they were needed.

It's likely apocryphal but having worked with some Chinese manufacturers I like to believe it.