I sent an email to the USGA. Below is the email in which I used to contact them with & explained what was missing , fast response from them on both times.
usga@usgamemberservices.org
Email from them
Dear Anthony Schubert:
Thank you for your recent correspondence to the United States
Golf Association. I apologize that the US Open hat was missing.
I have requested a replacement package for you. You should
receive it in the next four weeks or so.
Thank you for your support of the USGA. To update your personal
information, such as your phone number, mailing address or e-
mail address, please visit https://members.usga.org/email.
If you need further assistance, please contact the Members
Program at (800) 223-0041 , 9:00 a.m. - 4:30 p.m., ET, Mon. -
Fri. or via e-mail at USGAMemberServices.org.
USGA Members Program Customer Service
[Q128284719200472]
ZAT