[Britwrench]

If you are not the original owner, the engine may been replaced before.
Why does this matter? Even if you have the engine number, what will it tell you?
You already have the VIN, what did it tell you? Well the engine number will tell you the same thing...nothing that is relevant.

If you don't like or have no confidence in the dealer, find another one.

It sounds like the evalutaion report is testing the vehicle on a Piwis tester and printing the report.
What was the reason for having the test done?