SAT - Late fee for Sunday registration through mail

The college board website states in regards to signing up over mail for the Sunday test date: “Mail your registration and payment by the late registration deadline (for mailed registrations).”

Does this mean that the late fee will apply for all mailed applications postmarked after the regular deadline? Or, do mailed registrations for Sunday test dates not require paying a late fee? If you’ve had experience with this please let me know what the policy is! Thank you : )

Update: the late fee does apply for mailed registrations sent in after the mailed registration regular deadline.