Legal analysis: Generally speaking, you should have the original mortgage buyer's contract and the original commercial housing agreement from the date of signing the contract. If the developer wants to go to the real estate management bureau for filing, your contract may be sent to you after registration, because the last page of the registered contract has the official seal of the local real estate management bureau for filing and registration. If there is no such seal, it proves that the house is not registered. The commercial housing sales contract signed at the time of purchase shall be in quadruplicate, one for the general bank as a loan, one for the developer, one for the registration of the real estate management bureau and one for the owner. From the date of signing, you should have the original buyer's contract and the original commercial housing agreement. After the general loan is approved, the owner begins to repay the loan, and the mortgage contract is generally handed over by the bank to the developer, who then issues it to each household. Under the present circumstances, you should get a mortgage contract. If the developer wants to go to the real estate management bureau for filing, your contract may be sent to you after registration, because the last page of the registered contract has the official seal of the local real estate management bureau for filing and registration. If there is no chapter, it proves that the house has not been registered as a real estate. The most effective way now is to see if you have an invoice or receipt when you buy a house. If yes, you can go to the local real estate administration for consultation with the purchase receipt to see if it is being filed. If so, don't worry. If there is no record, you must go to the developer to make a copy or sign an original for you.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.