Did you have the form stamped by customs before you gave it to Global Blue? That is required in order to receive the refund. Once stamped by customs you have two options: (i) take the form to the stand if there is one at the airport (in your case there was), or (ii) drop the envelope with the form in the Global Blue Box. I believe you can also mail the form back by dropping it in a postal box at the airport, but the company usually has a stand and/or box at the airport. Cash refunds if the form is handed over at a stand are immediate, but you get less back. Refunds to your credit card if the form is handed over at a stand still can take a week or so to process. Refunds dropped in the box can take several weeks...even months, I've heard. If you have a copy of the refund form, you can track your refund on Global Blue's website. Declaring your purchase with US Customs and possibly paying US Customs Tax upon returning to the states is a totally different issue. HTH