I have just purchased 20 odd Sonoff devices from different suppliers and different devices.
The ALL have QC card Passed by 01.
Just saying very busy guy! 
Electronics manufacturers that I have worked with only had a very limited number of QC#, whether it was a sticker, stamp, or otherwise. The same number would often be shared across multiple shifts.
Let's face it, Sonoff is not doing a deep investigation if you report that your $9 motion sensor had a quality problem. So, why have more granularity of data?
All very tongue in cheek
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I noticed the same after buying a bunch of Sonoff Zigbee plugin outlets from eBay. At less than $6 each shipped straight from China I was willing to roll the dice, but I tested them all when they showed up and noticed #1 on mine, too. 
Because why would you want it inspected by #2, #85, or whatever. Obviously #1 is the best inspector! 
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QC01 is a friend of mine. He works 168 hours/week and brings home $1.68/week.
He's very tired and says he may have missed a defect or 2.
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He's also due back in School Monday morning because he's only 12.
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