就算他對,看看這個文件...沒說可以有三本,而且是一樣的.

Applying for a Second Passport Book. If you have a valid U.S. passport and you meet several additional requirements, you may be eligible to apply for a second U.S. passport book. In limited circumstances, we will issue a limited-validity, second passport book to you which will be valid for up to four years.

https://travel.state.gov/content/travel/en/passports/have-passport/second-passport-book.html#:~:text=Applying%20for%20a%20Second%20Passport,for%20up%20to%20four%20years.