Few more items to check
This is based on my personal experience...which I walked away. I was looking at 15" MBP early 2011 model with 750gb hdd...
1) Be ready to walk away.
2) Ask lots of questions like - when did you buy? Why are you selling it? ask questions via e-mail, ask same question via phone, and ask same question in person. Reason is that if the person is lying, he/she will have different story when same question is asked.
3) match the serial number on the casing to the system
4) negotiate the price, but lowball it a little to see how the seller would react.
here is my story...based on the above items...
1) I walked away...cause everything just didn't line up correctly. Even the price was awesome, just didn't feel right.
2) Asked question via e-mail about when and why. Well, as far as buying part, on the listing he said he bought 09/2011 and want to sell it because he needs the money. When texting about software installed, his story changed it to "I bought it from my friend"...then met him in person, it changed to "I am selling it for my friend" OK buddy.
3) Serial number on the unit was all scratched up, but still somewhat recognizable. Well, from what I can see, it wasn't matching up with the "about this computer" serial number. Why would anyone scratch out the case serial number is beyond me.
4) so, the computer was in worse shape than how it was described. he was asking $1200 for it. So, using condition as a reason, I offered him $900...he goes, I need to call my friend to make sure he is ok. I was like "I thought this was your computer? Why do you need to get your friends ok?" That's when he told me about selling this for his friend reasoning. Anyhow, after few minutes he came back said "OK, I will take $950". Ok...don't even fight back on this incredible machine.
Just nothing made easy about this unit. Non of his stories made any sense. Asked for activation code for his so called "installed software", he had non. Asked for a box, don't have it.
So, if something doesn't feel right, just walk away. That's my story.