First let me thank everybody on this forum for all your amazing tips and knowledge. I wouldn't have enjoyed my Kronos 73 nearly as much without your help!
So here is the thing: I was offered a very good deal on a Kronos X61 from a local music store. My only concern is that it is such a good deal that I am wondering if the unit might be a refurbished one or a B stock unit.

Is there any way of knowing for sure if a Kronos has had a previous owner?
Anything that I should look at or signs that I should pay attention to?
Thanks a lot!
T.