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The Eurostar website has been updated. Unfortunately it does not mention any customs office in Amsterdam (emphasis mine):
- Claiming VAT on purchases made in the EU when travelling from the EU to the UK:
Non-EU residents may be able to claim back VAT on purchases made in the EU from retailers that are part of the VAT refund scheme. Please note the minimum qualifying amount may vary by country.
You will need to show your purchases, receipt, passport and completed VAT refund form in your name to customs officers at the station to get your VAT refund form stamped. The customs office can be found after passport and luggage checks in Paris Gare du Nord, Lille Europe, Marne-la-VallΓ©e (Disneyland Paris) and Brussels-Midi/Zuid. Please arrive at the station a little earlier than usual if you plan to claim a VAT refund.