1. Negotiate with farmers: communicate with sellers and ask them to provide written contracts or receipts as proof of purchasing wood, which should include relevant information, such as purchase date, quantity and price.
2. Seek proof from a third party: If possible, seek proof from a third party, such as neighbors, friends or witnesses, who can act as proof of your purchase of wood and provide written proof.
3. Seek proof from ICBC: you can bring relevant evidence of purchasing wood, such as photos, communication records and chat records, and go to the local ICBC for consultation and ask if you can provide proof materials to prove the transaction.
4. Consider risks: there may be some risks in buying wood without an invoice, because there is no formal purchase certificate to provide. When doing such a transaction, please be sure to establish a trust relationship with the other party and determine the source and quality of wood as much as possible.
Important: The above suggestions are for reference only. Please apply it flexibly according to the specific situation and consult professionals.