I'd phone Google or contact them telling them.
Maybe they'll let you keep it for free? At worst they'll pay for the shipping back. At worst, once they track down you have an extra one they may just charge your CC twice.
The only time I've ever used NFC was to demonstrate to people S-Beam on my previous S3. Apart from that I usually have it switched off as I dont seem to have any use for it. I'm begging for Visa or Google to come out with a payment app that I can link to my credit cards.
I tried downloading EE's Cash On Tap app but it says the device isnt compatible. Are there any wallet/payment apps that can be used in the UK with Tap to pay?
Yeah I didnt think it came off. Or if it did it would leave a mark. However, just took it off there and is similar to the little protective side stickers that were on the phone in the packaging.