Let’s say I bouth the card in the US and want the warranty applied in the EU. Or vica versa. Can I do that? Is it worldwide? Or I have to ship it back to the country I bought it from? Does Sandisk at least cover return shipping?
Also, what documents are needed that I bought the card and it’s not a fake?
Very rarely. This is a user’s forum. That’s why I supplied the link to SanDisk Customer Service contact info world-wide. If this is an issue for you or have questions, they would be the people in the position to ask for clarification.