I will have to go read the regs to be 100% sure, but IIRC your air carrier must serve the airport that you are trying to go security without a boarding pass. The TSA doesn't have to accept the crew I.D. if they don't want to. I have recurrent GSC in a few months, but if I am looking for some fun reading material on my next overnight I will thumb through the AOSSP and get the exact verbage.