I know everyone here is pessimistic, but believe it or not, yes I bet that listing is legit.  Soldier Blade is in a legitimate spike right now, case + manual are going for $350 or so and adding box probably puts it around $500-$600 at least.  When things are in a drought people panic and prices explode, that's how it goes.
I sell a couple hundred items on eBay a year and I may get one or two non-payers.  A few bad apples is not the norm, despite the commentary here.