Look to be new blank dev boards for GBA. Not any practical use being majority of developers could use flash carts to achieve the same end result for s fraction of the cost. To obtain the equipment needed to write to these and the software is not something the average collector will come by.
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Correct, those are blank and new as far as I can tell. Nintendo sold these official flash carts, but most devs I know just bought aftermarket flash carts for a fraction of the price instead.