There's a few other precautions you can take, (I'm talking generally), photograph the items before shipping, and also the packaging including labelling etc if possible. I've done this a couple of times in the past. I did this when sending a large heavy lens for repair to show the optics etc were perfect and the overall condition.

It's worth doing this because it might help with a claim if an item gets lost or damaged, or if there's issues with a buyer saying it's not as described. I had a problem with a UK repairer/importer a few years ago and wish I'd done this.