In the end the lens came back broken. I had close up photos of the tiny screws in different positions so the lens had been opened up. In the end, and only on appeal , Ebay gave me a full refund. But I believe the buyer also got his full refund too.  The Ebay customer service person also deleted a negative feedback which had previously been denied. For once I am satisfied. However it has left me wary of what I sell on here, especially high value items, in particular camera lenses which can be harvested for parts and then returned as 'not as described', and I as the seller do not have the benefit of the doubt.