[talrodil]

Why wouldn't it work? They just assume it's my fault the box arrived empty at the warehouse?

Ask yourself what story are you trying to tell with the dry ice.

Then ask yourself what evidence do you have to support this story.

Best case scenario: let's say you can prove that you sent a package with x weight, which arrived empty at the other end. Most carriers don't weigh return packages, but let's say they do. Amazon can just say "we didn't receive the item and will not refund you" because that's exactly what happened. They don't give a fuck about shipping weights etc. (Unless your account is in great standing, and then they'll just refund you out of courtesy.)

In the end you have to either fight with the carrier, trying to prove that the weight disappeared during delivery or make a chargeback request with your credit card company. Your credit card company might be more inclined to listen to your story about shipping the correct weight. But that's a long process that can't be used often, and Amazon can still rebill you later.

DNA/EB is much easier and quicker. But still requires an aged account. Therefore I just avoid Amazon, too much hassle.