刚才amazon网店上咨询退税的事情，他的回信有点不明白的，请指教！

kelly926

We will be happy to refund all the VAT you were charged for your
order (order number see subject line).
For legal reasons we are required to ask you to furnish proof
- that your residence is outside the European Union
- that the items you purchased from us have been declared at the customs。
第一个只要护照一复印就行了。第二个需要在海关报关，是怎么回事？
难不成我要回国了，在海关报关了之后，在给他寄过来？

麻烦解答一下，谢谢了