Oh, I figured that those may have come from the people making the carts. The warranty sticker on my cart has the letters AM on it, as well as some sort of checklist that is represented with numbers.[/quote]Those stickers are put on by the retailers, to mark the purchase and warranty. That's why they placed them over the screws, to prevent folks from opening the carts. These typs of things are still placed today on products, by retailers, for the same reasons.
There are some that come from the manufacturer, if the company actually manufactured and distributed its own carts, more likely in their home region. I've seen SKOB, Sintax, Gowin and Waixing carts with either the company's logo or initials on the sticker.
But yeah if it's a more generic cart or an exported one, or one that's been resold a few times, the likelihood is greater that the sticker came from the retailer or some distributor somewhere along the chain.
"A Chen" stickers are super common for example, they show up on GB/C/A carts found all over the world - I assume they must have been a big distributor at one point.
As something of an aside, it seems several new Gameboy multicarts I bought from Taobao are actually using Everdrive moulds, possibly dodgy night shifts at the plastics firm...
(http://b3.ifrm.com/30023/163/0/p3005932/everdrive_moulding.jpg)
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- everdrive_moulding.jpg (137.57 KB) (http://b3.ifrm.com/30023/163/0/p3005932/everdrive_moulding.jpg)