second hand Hasselblad H4D-50(MS) - how to check it?

[Grimi]

Hi,
I have just registered here and this is my first post hopefully not last 
I decided to enter the new world of hasselblad - want to buy H4D-50 as it seems I can afford it.
My field is fashion and portrait so I think hassy is a good direction mainly due to dynamic range and quality of image.

There are 2 second hand H4D-50 and H4D-50MS, both come with kit lense 80mm/2.8 and at the same price around $6000.
I am going to check it and then finally choose.
I have already sent serial numbers to hasselblad to check the history.

Could you please advise on what should I check to be sure as much as possible that the one I have in my hands will be good one?
Thank you for help!

Best regards
Leslaw