My more complete answer about der location WRT boxing is whether the rear wheel will stay on the bike or not. In most hard case boxes the wheels needs to be removed, leaving the der much more exposed. So in these boxings I remove it. But when using a cardboard shipping box the rear wheel is usually left on the bike. This does a good job protecting the der from some impacts. So I leave it on but shift into the inner large cog and zip tie the cage to the spokes. Then I can disconnect the cable from the stops easily gaining slack to position the bars more easily.

I use to do rather extensive wrapping/padding work when boxing bikes (and I do 15 to 25 each year) but lately I've only protected the contact points to a high degree. I do take much care that there's no shifting around of the parts (ft wheel, pedals, bars, seat/post, and more) by using a lot of zip ties and separate parts boxes. I unpack and assemble a lot of bikes each year, that have seen packed by other shops, tour companies (the worst) and owners and have seen a LOT of really bad jobs. Andy.