Inquire with the public security organ where the official seal unit is located, because the official seal can only be engraved after being audited by the public security organ. At the same time, the public security organ has the official seal of each unit or company for the record. If the public security organ provides online consultation service, it may fax the color photo of the official seal to the relevant person in charge of the public security organ for help. You can also check the official seal backup at the engraving factory or engraving shop designated by the public security organ with the letter of introduction from the unit.