Often "refurbished" is no such thing.
It is often just end of life stock that cant be sold at full price, or maybe something that a customer bought and never opened and was returned to the shop.
I bought a refurbished laptop from a well known online shop a few years ago and when it came it had obviously never been opened.
Of course I mean if you buy a refurbished one from Tesco, or Argos or other well known outlet, not from an individual selling it on ebay for example.