Time for LED TVs - Help/Suggestions required

I am planning to buy a used Samsung UA55f6400,a 55 inch 3d,smart led.
I would like any inputs for whuch I should look before closing in the deal.
Especially the usage hours of the tv,how can I check the Number of hours for which this tv has been used.
I am getting it for 60k asking price,is it a gud price or should I go in for some negotiation?
Any additional tips befor buying a used led.It's a july 2013 purchase,any idea of figures I am going to be looking at for usage hours?
Earlier the seller was not sure of wheter he is having a bill or not,but now he's saying that he can arrange either for a duplicate bill from croma or will try to search for old one.Do croma really issue duplicate bill when asked for an already sold good 1.5years later?
Should I put in this much of worry,on getting a bill or can I buy it without bill as well?
The seller is saying he was having 1 year warranty and now I would be able to buy an additional warranty now,can it be true with a gap of 5 months with nil warranty period?
Any inputs would be highly appreciated.
 
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