Disklavier

I'm wanting to purchase either a dc7a or dc7aPro. Looks more and more 
like it's going to be the dc7a. The dealer in my area has gone 
bankrupt after decades of business so I have to go out of town to 
purchase. I might even go out of state if I can get a better price 
that's worth it. My question is how would I know that a piano that is 
delivered will be a new unused piano? I think I've read somewhere that 
I need to see the piano in person and write down the serial numbers. 
But even if I travel to the piano, how do I know it is unused and new? 
Also has there been any upgrades to the dc models this year? Thanks