I replaced my flex disk on my 260E yesterday and someone said they thought my transmission looked unusually clean...I did no cleaning at all on it.

I have no history on the car at all and the PO never returned my calls.

Is there a way that I can figure out if this is a new transmission? or not the original transmission in the car?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k