That's an interesting one @Steve-Peake. It's a shame they don't have more of a description/explanation of those two items. If there's an NFC tag located in there somewhere it might be for your personal details perhaps?
One thought would be, since NFC tags are a passive device, to add your details to an NFC tag and lock it permanently read only - then secrete it somewhere that it can be read but not accidentally.
There's no better proof that something is yours than having your name digitally hidden in the item eh.
