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Lexmark made a desktop laser printer that could encode RFID transponders in labels. I’m not sure if that company still makes the printer or if it offers paper with an RFID transponder that could be written to, but it would be worth reaching out. Also, Hitachi has its Mu chip, which was designed to be embedded in paper. However, the read range is only a few millimeters, so you might not be able to read it from outside a box. Plus, it uses a proprietary air interface, so anyone trying to read the tag would need a Hitachi reader.
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