What to look for before buying a used PS3 so that i may not be cheated?

[TomPal]

Hey Guys, tomorrow i am going to buy a used PS3 Ultra slim. This will be my first ps3 that is why i want to know what should i look for before buying it.
The system (version 3.55)includes (according to him):
2 Dual Shock Controllers
1 sensor
1 camera
23 Popular game disks
The system is under warranty and he is saying the warranty can be further extended after paying certain sum of money afterwards.
I will check the system for the first time tomorrow that is why i need help so that i may not be cheated.
Thanks and Regards!

 

[dark_lord69]

Just test and inspect.
1. Turn the system on and make sure it's functional.
2. Test a game to ensure games are loading properly.
3. Play the game a bit to test the controllers, sensor, camera
4. Look at the bottom of each game disk to ensure it's not excessively or deeply scratched.

Not sure what else to look for but that should cover most of it...

 

[TomPal]

Actually he is ready to give me all these things for just INR 9500 ($150) after some bargain. That's why I am just having second thoughts how can he give so much of stuff with a large collection of 23 gaming disks for this amount of money.
Is there anything i can check to assure that he has not done anything wrong with the system and the system do not collapse in the first week itself?