CAS boarding?

Just wondered since I booked thru Casino dept for the first time, if I board with them in NY or stay with the platinum cruisers? Thx?

In October on the dawn we were 1 st time platinum and CAS. We got boarding number 2. We did not finish check in until 11:15 so I do not know if boarding # 2 was due to cas or platinum or both. We were brought right to the first waiting area even though all others were full.

Thx! Thought there might be a separate checkin?