Chinese scammers have gotten good at abusing those "codes" by having a list of "known good" codes and printing them on multiple units. And because those holographic codes some companies used are printed in China, the scammers just use the same equipment during the night shift.
replyhttps://www.bunniestudios.com/blog/2010/microsd-card-failure...
There are methods of doing so that identify multiple, harder to falsify things.
replyOne that I have seen is HMAC(serial||SKU) as a datamatrix/QR, laser-etched onto the top silkscreen and burned into a PROM.
Package the product with a low denomination paper currency, lookup based on the banknote's serial number.
replyfun fact is that some chinese electronics manufacturers do exactly that with their products (even simple ones like led night lights), holographic qr-code on box that can be scanned and verified without opening box and second code inside box to verify box wasn't swapped
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