Sadly, you can't control what happens during the shipping process. But you can control a few factors that will decrease the chances of something bad occurring. First, upgrade to the fastest shipping available. You're already paying a lot for the instrument so spending a few extra bucks is worth it to get your clarinet sooner and keep it from staying in transit too long. Also, try to be at home during delivery day. Once the clarinet arrives, you can bring it inside and keep thieves from taking it. If you're buying a wood model, try to order it when the weather around you is mild. Then, you can keep the clarinet from having to react to extreme temperature changes that could cause the wood to crack.