Mileage Determination

[sharper410]

So subsequent to me buying my Boxster, I found out that the mileage reading on the odometer is not accurate and was at some point "rolled back". The local dealer also confirmed it was previously brought in with catastrophic engine failure with the recommended fix being replacement. So I'm 99% sure the engine was replaced with one out of a wrecked Boxster and was wondering if there is a way to determine if the dash was replaced at the same time and maybe reflects the actual mileage on the engine. I have an Autel code reader and it reads a different VIN in the instrument panel. Are there any other codes in the DME, instrument cluster, or elsewhere that can link the engine to the odometer?

The car runs great with the only fault codes being in the airbag system and am just trying to fill in blanks in the cars history should I ever decide to pass it along to a new owner.