Here is my concern on a engine new in box, sealed. We hear of this from all the manufactures. I got this in and this was broke or that was broke. Okay now I buy your engine new in box and because it's over a year old the manufacture will not fix it. I know it's rare but it does happen, That's why I rather have a engine that has been tested and if possible retested before shipping. To be honest, Ebay I don't worry about that as they will back you if it happens. I don't think anybody would have a knowledge of it being broken if it is sealed but it puts both in a unwanted situation.
But for me to consider something I want the following
Tested yes/no
If possible stock number by manufacture or at least the number on it.
Pictures of the item in post or thru email prefer in post. ( E-bay requires this. )
I do not see theses as a angry posts from anyone. These are good folks explaining what they want to consider a item for sale.