Is it possible to redeem 12 month membership card without scratching the barcode?

I'm looking to purchase a 12month card off of kijiji, but not sure if it is possible that it is already redeemed without scratching that barcode thingy on the back. Don't wana get ripped off.

Edit; here is the link so people don't think im a scammer or some dumb shit.

http://ift.tt/2yIvzrT