if it's a core system (aka Arcade, no HDD), I wonder how he got the wireless controller. Those are packed with wired ones.
If it's a 20GB system, those retail at $259.99 and they're discontinued.
If it's a new 60GB system, those retail at $299.99 and this would be a semi decent deal. I'd ask for a scan of the receipt to see the serial number match the one on the console.
Also, shipping on something this heavy is the deal breaker. It'll be about $40.