Hi getin:
When I took the OAT, I didn't receive my ticket until the Monday before the exam. My friends also received the ticket during the week the OAT was administered.
If you are still worried or you want to check if you got placed in a specific test location, here is the contact information:
Optometric Admission Testing Program
211 East Chicago Avenue, Suite 1846
Chicago, IL 60611-2678
(312) 440-2693.
Good luck,
Rosanna