Yes, you always have to send your lots by registered mail with confirmation of receipt, unless you can show proof that the lot cannot be sent by registered mail. Catawiki may require proof of delivery to the buyer such as the signature for the receipt and/or the Track & Trace delivery confirmation at the delivery location. Additionally, we highly advise that you insure your shipment.
We also highly recommended that you track the status of the order after you've shipped it. In case of delay or any other anomaly, please contact the buyer via your Catawiki order detail page. If the Track & Trace code is incorrect, you can now change it yourself. Simply go to > Orders and choose the relevant order. Click on ‘Update’ and update the relevant Track & Trace code.