In practice, such a thing is as low as winning the lottery, so no one has enough practical experience.

I want to ask how do you know? According to the truth, you should have been notified by the Trademark Office. The evidence you want to submit should have some warnings in the notice.

Generally, you can submit the following materials: the contract signed between you and the printing factory to manufacture or print trademarks, promotional materials or advertisements with related trademarks, etc. , and you used the trademark when attending exhibitions and other public places. In short, it is all the cases of using trademarks before application. In theory, the sooner the better, because the other party may also submit evidence of using the trademark, depending on which one of you used it first.