These are Official Nintendo Dev NFC Tags, Made for making and testing Custom Amiibo's. They can exceed the bytes and are reflashable. They also interesting enough well... I'll just leave you with this. The headers are very interesting

who knows you might be able to redirect the system...
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I'll also say you exploit maniacs may want to relearn what a plaintext- exploit is... It might be useful for especially 11.2

aka the structure is plaintext which might have a *bug* or 2