As with any auction- if anything doesn't look right, just haul ass in the opposite direction- there will be other deals and opportunities.
That said, you could always ask for new photos and maybe one showing the guitar with a piece of paper next to it showing the auction number or your email address written on it to show that the seller actually has the guitar handy.
Of course, if they guy is a scammer, it doesn't matter whether or not they have the item 'cuz they ain't sending you anything anyway!
"I like Christian rock. It's very positive. It's not like those real musicians who think they're so cool and hip." -George Costanza