The process to get a refund normally works as follows:
- The store gives you a form for your purchases
- At the airport, you get the form stamped by customs
- You then give the stamped form to someone who will process the refund. This can be done either by visiting a tax refund office at the airport (note that this is different from the customs office) or by mailing the stamped form back.
If the form was stamped, just return it by mail, there should be instructions on the form for that.
If you couldn't get the form stamped, https://www.germany.info/us-en/service/09-Taxes/vat-refund/906296 tells us:
Certification by German diplomatic or consular mission (exception)
In very rare exceptional cases a certification by a German diplomatic
or consular mission is possible. A plausible explanation has to be
given in writing why it was not possible to receive the export stamp
at the port of departure from Germany.
The same procedure as at the customs service applies:
- original receipt
- export papers or Tax Free Shopping Check
- purchased goods (unused/unworn in its original packaging and with price tag)
- and your passport together with proof of residency have to be presented to
a consular officer for inspection.
Please note that the certification can only be issued for goods
purchased in Germany (for goods purchased in other EU member states
please consult the respective Embassy/ Consulate).
Make sure to present the goods to the correct German mission. There
are nine German missions in the United States. Each of them covers a
specific geographic area. To find out which one can assist you, please
use our Consulate Finder.
Please note, that one of the criteria to receive the tax exemption is
that the article(s) must be exported before the end of the third
calendar month following the month of the purchase.
If the purchased goods are presented to the competent German foreign
mission later than that, the time of export has to be substantiated
through appropriate documentation (e.g. airline ticket, entry stamp in
There is a fee of 34.07 Euro for the seal on each individual export
paper. The fee is payable either in cash (equivalent in US-$ according
to the daily exchange rate) or by internationally accepted credit card
(card will be charged in Euro, additional charges by the credit card
company may apply).
The page is geared towards visitors from the US, but I suppose the same principles apply elsewhere.