I'm selling mine on craigslist and mine are legit. I'm a season ticket holder and if someone needs to question whether my tickets are legit or not I'm more than willing to meet them at a ticket master.
For the playoffs whoever buys them I'll be ripping them out of the booklet in front of them so they know it's legit. Plus I usually get them to come to my apartment. Hell I show them my DL too to prove to them I live here. I have nothing to hide when it comes to selling tickets so I don't mind.
But as Raybot said, just make sure they are hard copy tickets and get some sort of way to prove where he lives (DL or ID or something) in case you need to get a hold of him/her.
BTW my tickets are still for sale but I'd be breaking rules if they were posted on here. PM if interested
edit: reason why I have not posted the tickets in the classifieds is because they are not listed at face value so unless u realize that and still want them, then PM me