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If it's 100% certain that the fluid is NOT leaking externally, then about the only other place it can go is into the engine/combustion chambers - i.e. head gasket breach/leak.
If that were the case you'd likely notice some white smoke (steam) exiting the exhaust pipe at times.
Checking for a head gasket leak is quite simple and quickly done - you might discuss that idea with the Dealer.
Good luck/Bill
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