Mine doesn't beep either, it only locks and blinkers flash. The manual says under the tach settings I can change it to beep and flash, but my car only has the option to flash, or nothing at all; no beep option. I have an 07 MCS too.
If you are concerned about not waking your neighbours up with the sound of your car beeping, maybe you could just get into the habit of locking your car and then shouting, "My car is now locked". I'm sure that this will be equally annoying.
I don't really care either way, it's just weird that the manual in the car says you have the option to put the beep on, and shows you how to. Whatever. I have more important things to be concerned about. Like an exhaust.
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