All letters were sent registered and insured for zero amount. The costs involved vary from reasonable to expensive. Minimum charges are between DM 20-30. Certificates cost between DM 20-40 for all stamps with a Michel value of DM 1,000 or more. Payment is another problem.
Some collectors enclose cash with their stamps and have incurred none, or very little losses.
Others buy American Express travelers checks in DM, endorse them to the expertizer and include this with the stamps. Packaging should be in as small and unobtrusive an envelope as possible so that the German Customs Office is not alerted. This requires a visit to the Customs by the expert and payment of additional fees. Do not use many commemorative stamps, but the highest valuestamps to make up the minimum number of stamps to pay the postage. Do not use any plastic tape to seal the envelope, only paper tape.