We've sent quite a few and they have all got there ok, though we did have one box that took a long time to get there. Never found out why it was delayed as I didn't really believe anything the company said.
As LadyJ says use plenty of tape as I know of others who have left patches of bare cardboard and their boxes didn't turn up in one piece. I think they got wet and soggy rathered than being tampered with.