Thank you everyone. We are close to a compromise I think. She is considering the option of keeping the cello and then wrapping in greaseproof paper - thanks very much for that suggestion @Kerry Beal. I hadn't even thought of that . Still looking for that black greaseproof paper though so if anyone in Australia has any suggested possible suppliers I'd love to hear them.
p.s. this is my first wholesale sale so I'm super excited
p.p.s. now I've been brave enough to make my first post, you'll see me here again!