Whilst your chances are extremely slim, like Robin said, the best chance is on twitter. There are a couple of arsenal ticket accounts that are moderated, so they are generally safe and all tickets at FV, but there are the occasional scumbags that try a scam. Your best bet is to find someone who will meet face-to-face. I've done that before. I've chanced it twice with paypal and delivery and got scammed one of those two times. Unfortunately, I was one of the first with that seller. Always a risk when not face-to-face.
In case you want to have a look, here are the twitter accounts (I've used the 1st 2):
@arsenal_tickets (best one imo)