the statement on the loss of the house purchase contract should clearly state the name of the party concerned, the ID number, the time when the house purchase contract was lost, the location where the house purchase contract was lost, the completion status of the contract, the specific address of the house, and the number of the real estate license, and clearly state that "the contract is invalid because it was lost", and finally sign the date.

legal basis

Article 558 of the Civil Code of the People's Republic of China

After the creditor's rights and debts are terminated, the parties concerned shall follow the principles of good faith and perform obligations such as notification, assistance, confidentiality and recycling of old things according to trading habits.

Article 559

When the creditor's rights and debts are terminated, the subordinate rights of the creditor's rights shall be extinguished at the same time, except as otherwise provided by law or agreed by the parties.