Unknown. According to the information about the lawyer's letter, we did not find out whether the lack of a seal in the lawyer's letter was a threat. According to relevant regulations, the lawyer's letter must indicate the name of the law firm and be stamped with the official seal. If there is no seal, or the seal does not belong to the law firm, there is no doubt that the lawyer's letter must be a forgery, or it must be a forgery. It has no legal effect. A real lawyer would never make such a stupid mistake. Most lawyer's letters will also have the lawyer's name, signature or seal. If it just says "Lawyer Zhang" or "Lawyer Li" without a full name signature or seal, it is almost certain to be a fake.