The sender shall place accompanying documents (delivery notes for goods, leasing documents, delivery and acceptance certificates, and other documents), which the sender wishes to receive back with the recipient’s signature, in a special plastic pocket and stick to the postal item, as well as specify that the return of the document is expected when preparing the item for mailing

Together with the item, the courier delivers to the recipient a delivery note for goods or other document. According to the sender’s instructions, the customer signs the documents and returns them to the courier, who delivers the signed documents to Express Mail to return them to the sender.