Teacher Code: Enter your 6 digit teacher number and click on submit. If you want to use the search without a teacher number, just leave the field blank. You will not be able to reserve items without a teacher number. Forgot your teacher number? Check with your Keystone AEA contact person in your building or call the Keystone Reservation Secretary at 1-800-632-5918, 245-1480 or 556-3310.