I have to say I would find it highly unlikely that your local store where you took the camera in would not have noted on the repair form if the lens had received significant damage prior to sending it off to Nikon for repair. If a customer brought a camera into me in warranty the First thing I would do is inspect the camera fully for any visible signs of damage, I think even the lowest sales assistant would have noticed a completely knackered lens. This points to either damage in branch or in transit, either way Jessops should manage the repair as a minimum.