You can always call CX and ask them what your booking code is.
At the airport, you can always ask CX for a print-out of your e-ticket as it is shown on their screen using their antique dot matrix printer!
The problem with e-ticketing and online booking sites is that it allows online providers such as Expedia to provide as little details as possible to the passenger. They assume that by providing all these details that the inexperienced traveller will freak out.
This is one reason why I still use travel agents.