Bought an iPod but still logged in to find my iPhone?

I recently purchased an iPod through Craigslist but forgot to check if it was logged out of find my iPhone. I now can't log in to my Apple ID unless the seller turns it off but I have no contact with them any more. Is there something I can do to turn it off or get around it and sign in or did I just get screwed over?

Well, you just wasted your money. Don't be an idiot and next time CHECK before buying.

There's nothing you can do about it. You pretty much have a useless brick.