This isn't a photographic suggestion. Rather, it is a life's answer: I'd recommend against any suggestion that includes lying! There are simply too many pitfalls, and in the short and long runs -- it's just plain wrong. Nikon did her a disservice by the way the lens was displayed, but she showed you love and caring by buying what she thought was a wonderful gift. Return the love and caring -- and the lens if it doesn't meet your needs! She'll appreciate the honesty and trust.