The lens and the body of a V series Hasselblad is only connected through a mechanical release plunger. Any shutter problem will be isolated to the lens and not to the body unless the auxillary shutter is the part giving brief which is easy to observe. Generally and unfortunately i have learned to treat all ebay purchases as well as any other second hand purchases in a way that i have to calculate service at a Hasselblad certified repair shop. I guess this is not what you should expect after paying a premium but quite often this is the reality unless you get lucky. Which can happen on occasion. My 2c.
Edit: Perhaps I should add: For those of you who have returned faulty items to eBay sellers, how have your experiences been? Does eBay have any official support for returning items?
I have returned two cameras (both in the US) and a lens to England. No problems at all with EBay, but it is up to the seller if they reimburse the return shipping costs. One seller did, the others did not. I also received a finder that had fungus in it, the seller refunded half the price and I cleaned it.