As stated multiple times the dealer does not check the diff fluid. No. 2. Also as stated if there is not a leak the fluid doesn't burn up, evaporate or disappear.
I'm going to go out on a limb and say you didn't check it correctly or you don't know what the correct level is. Either that or you have no sense of smell as diff fluid smells like hell and you would know if it was leaking as if would get onto the exhaust and stink something awful.
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