I think you're seriously out of touch with the market.
Even a 15.4" 2.6ghz penryn goes for $1400+ on ebay easy.
A 17" 2.6ghz penryn? $1600+ easy. $980 is INSANELY low. You can't even get a previous gen 15" 2.4ghz base model penryn for that much on ebay.
Those are good precautions but not always realistic and I'd say most people will not care enough to go through all those steps. Especially at that price, there are many other people willing to buy it if you're not. All you need is the serial number to check if it's stolen.
I sell stuff on craigslist all the time. I ignore people who are super paranoid and ask me to sign, date, or whatever - it is tedious and unnecessary as there is no way you can verify any of that information anyway. I say - just get the serial number and call to verify it is not stolen.
And BTW, you should skeptical that this deal is even still available seeing as it's been 3+ days already. Good deals in my craigslist areas are gone within a few hours.