退稅一定要用passport, 買完之後俾passport sales, 佢就會幫你填張form, but remember don't lost that form, cos in some countries, finally u need to refund the tax at airport
Besides, all LV in Europe will keep your passport details after u buy, usually restrict every customer to buy 兩個袋, 一個銀包 or 一個袋, 兩個銀包 only
After you buy once, you can't buy anymore in that country until six months later