I posted an ad on craigslist looking for concert tickets, and someone replied saying they had some. They told me their website, but that they would send me an invoice through pay pal and then transfer the tickets to me through ticketmaster. That sounds like it would work, right? But the concert isn't until September, so IF something were to happen would I still be able to get my money back through pay pal? Or do they have a time limit for that? Is there any way this person could scam me?