@ Chemos
Don't lead me on...
Just ensure you got all the proof that the machine was New. (unless it was pre-owned,which is unlikely given the prices of new machines have really dropped)
Ensure you were able to see the carton box in which the machine came and confirm the serial numbers are identical. Ensure new cables,restore CD e.t.c. I once almost paid for a notebook,but the money went back into my jacket,when the shop attendant couldn't produce the carton box and the genuine accessories that accompany the machines. It could either be a stolen one or a returned one (maybe because it has problems). Also check to see that the machine has not already been set up,at least not as far as having a computer name like David PC,Wanjiru PC or Ongwenyi-MartinPC,which would point to the likelihood that it has been used before.
And finally make sure they print (not super impose with a BIC) the serial number of the laptop you bought on the receipt. Don't buy that crap of 'we know our machines,so if it has a problem just bring it back we'll sort you out'.
The thing is there are shops and individuals that accept st.len goods for resale. Some of these are big,some small. Hapo siendelei.
Everyday!