It doesn't have to be like this. If an electronic application is submitted, there will be no signature of the patent office. If a paper application is submitted to the acceptance office, there will be a sealed acceptance notice. After the electronic application is submitted, the Patent Office will issue an acceptance notice within one working day. An electronic acceptance notice is an electronic document containing a certificate. You can check the authenticity on the website of the Patent Office. The electronic application acceptance notice was printed without seal!
We have this.