It should only be in the expansion box. The coolant level is not more than covering about one or two centimeters above the bottom of the tank with cold engine.
If the pipe is also empty, that is water lost.
That is from a leak or blown out by a leaking head gasket.
I suggest you top up a couple of times and see if it settles!
Do so when cold.
Leaks to look for:
Thermostat and pipes, radiator, all plastic parts, water pump, oil cooler, metal pipes in front of radiator (especially in the bends), crack in expansion box, radiator cap. There might be more, but this is what I can think of at the moment.
I have had all above, at one stage or another!!!
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