Check again, mine was missing but it's back now. It's doubtful they'll actually lose data, issues are probably just due to services that are offline.
I wouldn't blame yourself too hard.. Amazon has strategically made it very easy to add items to your lists (bookmarklets, chrome extensions, etc.) while offering _no_ supported way to get the list back out.
If you aren't being a little sarcastic, you are lucky. The bug saved you money for shit that you obviously are not wishing very hard for. Kids at Christmas time certainly don't need a backup....